Knock knock! Who's there? A light bulb joke! A light bulb joke who? Sorry, erm, we didn't really think this one through...
Yes, they're the oldest jokes in the book. Apart from 'knock knock' ones. So we asked our @HuffPostUKCom Twitter followers to tell us their favourites - old, new, overheard or created themselves.
Here are our pick of the bunch. Feel free to add yours in the comments below!