I know they're marshmallows...I'm not getting the reference to them jousting though...
I was assuming that they would hop around and one of them would stab the other or something though...not just melt. Nothing's cool about melting a marshmallow in a microwave.
You want cool? Take a toothpick, stick it in a piece of chewed gum and stick it to the bottom of the microwave. Then light it on fire and start the microwave.
THAT is fuckin' cool.