While YouTube is full of hidden video jewels, so many of them are nothing more than people getting cranked with bats/basketballs/ball-peen hammers in their own ball/peen. Which is the best, but there also exists more-elevated short filmmaking, at OpenFilm
North Miami-based Open hosts contests dishing cash prizes to filmmakers, but that doesn't matter to you; what does is that you get to watch 9,500 original, super-well-done high-def short films and animations in various categories on a large frame player, also what you'll be considered when you join a women's soccer team. Action's got fun like Iron Man vs Bruce Lee, a stop-action piece where said toys engage in a way-realistic clash with serious moves/sound FX, and the awesomely interactive Street Fighter, which lets you pick an opponent, then actually fight him (by clicking buttons on the vid's screen) as an action-figure Guile in a regular-sized kid's messy-ass room -- just pray you don't encounter his mom's Sonic Broom! Comedy features shorts like The Evolution of Dance, in which Optimus Prime takes the stage and performs everything from Elvis moves to the Macarena, and eye-candy-heavy New Jeans, where a hot blonde in her undies tries on all her similarly hot blonde neighbor's pants before they chase each other through LA, which is funny because...it's true? Wait, it's not funny at all. But they're hot
Of course, you can also submit your own masterpiece, as well as use Open as a filmmaking resource: it's got info on festivals, filmmaker social networking, and webcam chats with heavy hitters like James Caan and Robert Duvall, during which it's suggested you keep your family jewels as hidden as possible.
Check out SoHo's Hottest New Spot, The Special Club!