Joke format jokes

Knock knock. Who's there? Broken pencil. Broken pencil who? Never mind, it was pointless!

Yo mama so fat that she needs two watches for two different time zones.

Why did the chicken cross the road? To get to the idiot's house.

Knock, knock. Who's there? Chicken.

Knock knock. Who's there? Well, I will tell you who's not there: my dad.