While I'm sure some adults would enjoy this too, I'm specifically speaking of fun for kids with shaving cream.
Rainy day? Too hot to play outside? Just plain bored? Struggling for bathtime? Give the kid a can of shaving cream, strip 'em down and plunk them in the tub. Instant fun!
I gave my little one a $0.79 cent can of shaving cream and free reign to "play" in the tub. She covered herself and every surface she could find, including a cup, spoon and 3 barbies. About 45 minutes later, she was rinsed, clean and smellin' great. She later told me that this was "the best day of her life!". With feedback like that, you can't go wrong.
Shaving cream. They are already half way to a bath!
Trust me. Worth every penny....