♪ very, very heavy. i'm not big enough or strong enough for this. there should be some way to make it easier. [ doorbell rings ] [ morty ] here's a box, babe. open it up. oh my goodness! what is a wetjet? some kind of a mopping device. there's a lot of dirt on here. morty, look at how easy it is. it's almost like dancing. [ both humming ] this is called the swiffer dance.