500 Wild KnockKnock Jokes for Kids Author:Matthew Sartwell Knock-knock.
Who's there?
Justin.
Justin who?
Justin the nick of time!
Knock-knock.
Who's there?
Greta.
Greta who?
Greta life!
Knock-knock.
Who's there?
Summer.
Summer who?
Summer good, some are bad!
And hundreds more!