Koopa is in the bathroom of the house, trying to wash his trousers. He takes them off and turns them upside down and starts shaking them, to get all of the stuff out before washing them in the bathtub. A suit pops out from the pocket of the trousers (a suit within a pair of trousers!). Next, a miniature car, with a matching miniature shack, pops out onto the bathroom tile floor. Who knew Koopa had so much in his trousers. That's probably why he washes them so rarely, what a hassle!