A: Did you wipe your feet?

B: Yes, of course I wiped my feet.

A: Then why is there mud on the carpet?

B: I don’t know. It’s not my mud.

A: Well, someone brought it into the house.

B: Look at the bottom of my shoes—they’re clean.

A: Of course they’re clean. You left all the mud on the carpet.

B: Okay, I’ll get the vacuum cleaner.

A: Don’t vacuum it now.

B: Don’t you want me to clean up the mud?

A: Wait till it dries. It will be easier to vacuum.

B: Next time I will be more careful.