There was an old boy who swallowed a frog

Gianni:  Mommy, I swallowed a frog.


Mommy:  Huh?  What?


He places my hand on his chest and says solemnly:  See?  Feel that ribbitting?


Mommy (feeling relieved):  Honey, that's your heart.


Gianni (looking relieved):  OHHHH!  It's just my fart?