Erin McCarthy

Every week on the day after Monday, we're releasing new shirt designs in the mental_floss store. Today, it's #SMH. Whatever it is that gets that noggin of yours wagging back and forth will get a proper reaction when you throw on this head-turning shirt.

And that's not all! Take $10 off orders of $60 or more by using the code BRADDOCK at checkout. Deal ends tonight at midnight PST and excludes subscriptions, package deals, and clearance.

Did you know that you can submit t-shirt slogans? Cheryl M. of Daytona, FL, came up with this idea. She gets $125, a free shirt, and eternal "I designed a mental_floss t-shirt!" bragging rights. If you have a funny t-shirt slogan, you can submit it here.