The Genius of Knock Knock Jokes
| Knock knock! | Knock knock! | Knock knock! |
| Who’s there? | Who’s there? | Who’s there? |
| Cows go | Little old lady | Europe |
| Cows go, who? | Little old lady who? | Europe who? |
| No, silly, cows go MOO! | I didn’t know you could yodel! | You’re so childish! |




