Ducklings vs. Stairs. Link text pretty much sums it up.
Puppy teaches younger puppy how to go down the stairs. Cuteness ensues. SLYT
Hamlet is a pig. Hamlet really wants some oatmeal. To get that oatmeal he has to go down the stairs. (single link CUTESTTHINGEVER) [more inside]
A short film about that moment when you emerge from the subway and find yourself in a new and sometimes unexpected world. [SLVimeo]
Piano Stairs! (Not everyone thinks they're a good idea.) Also see "The Deepest Trash Can". Both videos are from Volkswagon Sweden, whose new English-language website, TheFunTheory is still under construction. But here's the Swedish-language version.
Stair Porn (SFW)
Push a guy down the stairs - in the past we've discussed people doing it to themselves but surely it's safer (and more fun) to try it out on others? (2mb .exe)