♪ norfolk southern what's your function? ♪ ♪ helping this big country move ahead as one ♪ ♪ norfolk southern how's that function? ♪ [ male announcer ] this summer, savor every second of vacation. but get your own cookie. enjoy a fresh-baked chocolate chip cookie at check-in and more, with rates as low as $99 per night at a doubletree. book now at doubletree.com/getaway. i don't do any cleaning. i make dirt. ♪ 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.