Hahaha...yeah, sadly enough we've done that just for entertainment a few times lol.
You can squeeze em, and make a dent, then put a lighter up to em and they'll go back to their spherical state. Handy if ur playin ping/beer pong and the ball gets smooshed. Excites the inner molecules, expands , etc. However if you hold the flame there long enough, you get a mildly funny pop. hehe.