Shooting Down Toilet Humor

(My dad, mom and I are sitting in the living room. My dad is relating jokes sent to him by a co-worker.)

Dad: “So, there’s this really funny one. It’s a picture of two guys with rifles standing over a toilet. The caption says, ‘Two guys shooting craps’.”

Mom: “Craps. That’s a type of fish, right?”

(My dad and I stare at her, dumbfounded.)

Mom: “Well, what else would be swimming in a toilet?”