The Argument Has No Legs To Stand On

(The marathon was earlier this morning. I am in line behind a customer who ran in it. The cashier is sitting down, while serving patrons.)

Customer: “I don’t have time for this. My legs are killing me. I ran the marathon this morning, and you can’t even bother standing at a cash register for one day!”

(The cashier wheels himself out from behind the register. It becomes clear he has no legs.)

Cashier: “P***y.”