Step One: Choose a target. (Grandpas are almost always a good target.) Sing grandpa to sleep.
Step Two: Place snaps under grandpa’s feet while he is asleep.
Step Three: Yell to wake grandpa up!! Make sure it’s something startling, like, “There’s a bear on your head!”
Step four: Laugh hysterically when snaps go off.
(Not pictured)
Step five: Get so caught up in tricking grandpa into stepping on snaps that we forget not to squeeze the ones in our other hand. Squeeze snap so hard it pops in hand. No major injuries other than being mentally traumatized for life.