Sneed's Feed and Seed (formerly Chucks)...I don't get it

Reminds me of an old joke.

A man had 3 teenage daughters. On a Saturday night, the doorbell rang. The man answered the door. There was a teenage boy standing there. He said:

“Hello, I’m Bo. I’m here for Mary Jo. We’re going to the show. Is she ready to go?”

The doorbell rang again in a few minutes. It was another teenage boy, who said:

“Hi, my name is Eddie. I’m here for Betty. We’re going out for spaghetti. Is she ready?”

A few minutes later, the doorbell rang again. It was another teenage boy, who said:

“Hi, I’m Chuck…”

SLAM