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I used to do this all the time when I was a kid, I absolutely loved it and annoyed anyone else living with me at the time since I could take ages just playing with them.
I still have two rubber ducks that I keep around, but they're kind of...in bad shape, neither of them can actually squeak anymore, so I've just painted them and tend to leave them by the window, greeting anyone that passes by. :D;
I had a rubber duck when I was like 4 or five but I never bathed with it. :(
All I did was just run around really fast around my house while squeezing it to annoy nearby people. :'D