When I was very young, I did discover that ketchup packets were the perfect size for "stomping" You place them on the ground and stomp as hard as you can on approximately half of the packet. The other half of the packet explodes violently and creates quite a bit of area damage without getting a single drop on your foot.

They are also the perfect size for putting in someone's shoes. You split the packet on both ends, then you hide them in people's shoes for a fun surprise.

They're pretty much not the perfect size to use as food though, oh well.

Calvin