What are a teacher's least favorite words to hear every summer?

Knock, knock. Who's there? To. To who?

What did the pen say to the pencil?

Why did the cow argue with everyone else on the farm?

What do you get if you cross a hen with a dog?

Where do cowboys cook their chili?

Why did the gardener have a hard time asking for a raise?

Did you take the patient's temperature?

Why are hairdressers great at basketball?

What do you call a noodle in disguise?

What's a dog's favorite city?

What do you call a Zen egg?

What cookie is so small you can hardly eat it?

Why is a frog luckier than a cat?

What do you call it when the ocean is calm around Christmastime?