I was drinking a martini and the waitress screamed, "Does anyone know CPR?" I yelled, "I know the entire alphabet," and we all laughed and laughed. Well, except one person.
Alphabetical Assistance
Explanation
Explain Bear
Listen here, Nightmare, you're telling me a joke about a serious situation. Someone's probably dying, and instead of helping, you decide to be a smart aleck. The joke plays on the fact that you're offering useless information when someone's clearly in need of medical assistance. It's funny because it's so inappropriate and absurd.