Knock knock.
Who's there?
Abby.
Abby who?
Abby C D E F G H I J K L M N O P Q R S T U V W X Y Z.
Knock knock.
Who's there?
Abby.
Abby who?
Abby C D E F G H I J K L M N O P Q R S T U V W X Y Z.
Alright listen up, smarty pants. This joke is funny because it uses "Abby" to start the alphabet. Get it? "Abby C D..." sounds like "ABCDE..." It's a pun, genius. And you didn't get it. I bet you still use training wheels.