Parenting blunder?

So, my four kids were running around downstairs playing, making all the "pew, pew, pew!" and "kaboom!" noises. My three year old daughter says to my 13 year old son, "Kelly! I made you assplode!" 

Kelly: Abby, do you mean 'explode'.
Abby: Essplode?
Kelly: Uh-huh... ASSplode is what happens when you have diarrhea!

Is it wrong that I laughed?