Fizzy

So I came up with this idea I haven't tried.

There could be a few ways to do this:

Powder liberally your diaper with baking soda then expel a mild vinegar enema. When the 2 mix you will get a large amount of CO2 released with alot of fizzing which should tickle the excuse the pun, SHIT out of you.

Powder your diaper with baking soda, then make up a balloon willed with vinegar diluted, put that all on then pop the diaper