Condom Slinky. Two words you don't normally put together, but will be glad someone did.

Enjoy this juvenile, yet somehow brilliant, trick (note the NSFW video) in which a condom is filled with water and then put on a staircase. It slides down the steps like a Slinky and ends up going much better than, say, an ATV that takes the stairs.

Aside from its intended use, this is probably the best use for a condom you'll see, assuming using it as a water balloon has lost its luster.

There's nothing like practicing safe sex, except, of course when you're practicing safe sex on the stairs. Just don't tell that to anyone trying to walk by you.