5 yo wants to pull a prank on his best friend

He's trying to enlist my husbands help.

The idea is to drive over to her house, ring the door and when she opens they'll say there's something on her chin. When she scratches they'll call 'muppet-lollypop'. Then they'll say 'bye bye poopie' and run to the gettaway car.

Dad should race away, but be mindful of the speed limit.