"I didn't think you were comin' back."

I hate customers. Last night I had a delivery with total $21.55. This guy hands me $40.55 and tells me he only wants $19 back. I hand him all the cash on me, total $13, and tell him I'll be right back with the last $6. He asks where his cheese and peppers are. He didn't order cheese and peppers, so I tell him so. He tells me he did and to bring him some. I leave, get change and cheese and peppers, and go back. He answers the door and tells me he didn't think I was coming back. He takes the stuff and hands me $1 "For your troubles." I hate customers.