I dunno, guys. I might be goin' out of business! [ Marty's gotta crack a joke at this. He gets a crowd of hearty laughs out of it, before turning back to the little kid. He bends down to their level. ]

Wanna help me finish up the song? I gotta have someone to dance in order to get it done!

[ He offers a hand, silently asking for the guitar back. ] You up for it?