Gummie Bears! When you visit a friend's home go to their bathroom and pack a few Gummie Bears in to their showerhead. The next time your friend takes a hot shower the Bears will dissolve and when they do they are colorless and odorless.
When they try to dry off their skin will become real sticky and it freaks people out.
I got that trick from The Amazing Jonathon Practical Joke Handbook.
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