Claude Clay, the undertaker, is talking to the Sheriff.
CC: “Watch my shop, Sheriff. I’ll be back in a few days.”
CC: “They’re staging an embalmathon in Dodge City to raise fund to cure insomnia among toe taggers.”
CC: "If you need me it’s being held at – "
Sheriff: “I CAN GUESS! I CAN GUESS!”
This looks like the standard set-up for a pun that’s so obvious, it doesn’t have to be stated explicitly. But I am simply doggoned if I can figure it. Any help?