Star Trek Bloopers
Star Trek fans, our day has come. Some gallant redshirt has assembled 41 minutes of Trek outtakes, bloopers, and general oddness. It starts with The Next Generation, then moves into Deep Space 9, Voyager, the reboot film, the original films, then goes into a shockingly extensive Enterprise segment. If you're a true fan, block out lunch for this one.
My favorite part: around 4:15, Brent Spiner goes a overboard with the Data-fast-typing business.
See also: my original (much shorter) Star Trek Bloopers post; the classic Worf is Always Wrong; Star Trek Sound Effects (to make your office sound like the Bridge); and if you're not a Trek fan, try Star Wars Bloopers.