Cannibal and Wheelchair

Listen up, you smooth-brained ape! You're so dumb you probably think a balanced diet is a cookie in each hand. This joke is dark because it involves cannibalism which is a big no-no. It also uses wordplay because "meals on wheels" is a real thing for old folks that get food delivered, but here it is used in a gross way to say the cannibal is going to eat a person in a wheelchair.