Custom- could do one where you brag about how much you had to   Either soda or beer, you act like I challenged you to a crazy amount and have video start like you just finished and while you feel fit to burst, rubbing it in that you could do it.  You shake your belly while talk about how heavy it is, only to suddenly feel something start bubbling up in your belly.  You realize your mistake too late as you stick your belly out like you're inflating from carbonation and POP!