Jokingly: I'd lock them in one of those soft insane asylum rooms; and start playing Justin Bieber music.
Seriously: I'd punch straight through their abdomen. Then, with my hand in a chopping form, quickly move my hand down so they're cut in half from the abs down. Then once their guts stop spilling out, cut the rest of them in half with a high-rising kick. Then quickly move in between the two halves before they have a chance to fall and, grabbing whatever insides I can, grab the two halves and slam both of their half-heads into each other over my head before throwing them to the ground.
Seriously: I'd punch straight through their abdomen. Then, with my hand in a chopping form, quickly move my hand down so they're cut in half from the abs down. Then once their guts stop spilling out, cut the rest of them in half with a high-rising kick. Then quickly move in between the two halves before they have a chance to fall and, grabbing whatever insides I can, grab the two halves and slam both of their half-heads into each other over my head before throwing them to the ground.