Guests visiting New York City's Waldorf Astoria hotel in the 1930s enjoyed an amenity that was unheard of at the time: waiters delivering meals directly to their rooms. While the Astoria’s reputation for luxury has endured, room service is no longer exclusive to five-star stays. Roughly 22 percent of the country’s 54,000 hotels [PDF] are willing and able to bring breakfast, lunch, or dinner to people who prefer to eat while splayed out on a large and strange bed.

To get the scoop on what goes into getting food from the kitchen to your floor, Mental Floss spoke with Matt, a hospitality specialist who spent a total of 10 years working in and around room service for a major San Francisco hotel. Matt preferred not to use his last name; since his stories sometimes involved naked people, undercooked chicken, and Oprah, you can understand why. Below, check out a few things you should know before you dig into that tray.

1. THE HIGHER YOUR FLOOR, THE WORSE THE FOOD GETS.

When a room service delivery employee takes a tray from the kitchen to your room, it’s typically covered in a metal lid to retain heat and to prevent other guests from sneezing on it. The higher up you are, the longer it has to travel—and the more that lid traps steam, soaking your food in moisture. “Food sweats in there,” Matt says. “Instead of having crispy, toasted bread, you get wet toast. The longer it stays in there, the worse it gets.” If you want crunchy fries, you’d better be on the first couple of floors.

2. DON’T ORDER SEAFOOD. OR STEAK.

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That lid is a nuisance in other ways. Because it traps heat, it’s effectively cooking your food in the time it takes to get from the chef’s hands to yours. “If you order a steak medium, it will probably be medium well by the time it gets to you,” Matt says. While you can try to outsmart the lid by requesting meat be cooked a notch lower than your preference, it's not so easy to avoid overcooked fish—which will probably also stink up your room. Instead, stick with burgers, club sandwiches, or salads. According to Matt, it’s hard to mess any of them up.

3. THE HOTEL CHEF MIGHT NOT BE PREPARING YOUR FOOD.

Just because you see a menu in your room, it doesn’t mean the hotel has a kitchen or chef on-site. To cut costs, more hotels are opting to out-source their room service to local eateries. “It might be ‘presented’ by the hotel, but it’s from a restaurant down the street,” Matt says. Alternately, hotels might try to save money by eliminating an overnight chef and having food pre-prepped so a desk clerk or other employee can just heat it up. That’s more likely if sandwiches or salads are the only thing available after certain hours.

4. SOMETIMES GUESTS INVITE THEM IN.

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No, not for the reason you’re thinking. Because so many hotel guests are business travelers who are away from home for weeks or months at a time, some of them get tired of eating alone. When that happens, they turn to the first—and maybe only—person who could offer company: the room service waiter. “People are usually traveling alone, so they’ll offer you food,” Matt explains. Sometimes the traveler is a familiar face: According to Matt, he once sat down to eat with Oprah Winfrey, who was eating by herself despite her suite being filled with her own employees. He also says he had a bite with John F. Kennedy Junior, who wanted to finish watching Fast Times at Ridgemont High before heading for his limo.

5. THERE’S A TRICK TO ORDERING CHICKEN WINGS.

Busy hotel kitchens aren’t always paying attention to whether the chicken wings they buy in bulk are frozen raw, frozen cooked, or somewhere in between. “Ask for them extra crispy,” Matt says. That way, they’ll be cooked thoroughly regardless of their freezer status. “I recommend that to everyone.”

6. THEY LOVE IT WHEN YOU FILL OUT YOUR BREAKFAST CARDS.

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Breakfast is undoubtedly the busiest time for room service, and those little cards that allow you to check off your menu items the night before are a huge help. “It’s great for everybody involved,” Matt says. “The kitchen can pace themselves and you can get your food on time.”

7. THEY WOULD PREFER YOU NOT ANSWER THE DOOR NAKED.

Yes, guests answer the door barely clothed. No, this is not optimal. “We don’t want to see it,” Matt says. “It's something we dealt with numerous times.” While it's likely your waiter will use discretion, any combination of genitalia, drugs, or illicit activity is best kept out of their sight.

8. YOUR USED TRAY DISGUSTS THEM.

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That move where you stick your soggy fries outside your door? It can lead to some awkward encounters. Matt says he’s seen other guests stop, examine trays, and then pick up discarded food from them. Other times, people leave unimaginably gross items on the trays. “I’ve found condoms on there. Divorce paperwork. All kinds of things.”

9. THEY APPRECIATE IT WHEN YOU CALL TO COME PICK UP THE TRAY INSTEAD.

Weird people aside, “We don’t really want it out there,” Matt says. “It stinks.” Instead, dial 0 for the front desk and let them know you’re done eating. They’ll dispatch someone to come and get it.

10. WHO GETS THE TIP?

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People pay out the nose for room service, with hotels adding surcharges for “service” and “in-room” dining that can turn a $5 club sandwich into a $15 expense. That’s not great news for guests, but it does mean you don’t need to feel bad about not offering a cash tip. Those service fees usually go straight to the employees who got your food to your room. “I never tip,” Matt says. “Most of the time, the service and delivery charges are given to the waiter or split between the people who answered the phone and pick up the tray. It’s better to leave it all on paper to make sure it gets divided up.”