Joke Time!~

This is not so much a game but instead, a fortnightly competition ^^

It's quite straightforward, whoever comes up with the best joke wins ^^
However, there will be a theme for each fortnight, and that's what makes it hard!

Both jokes or riddles are welcomed. The answer to a joke should be hidden by a spoiler ~

The winner gets to choose the next theme, and pick the winner of that round (the winner is not allowed to enter the next fortnightly comp) . The theme should not be too hard.

So, for example, if the theme was 'beach';

what did the sea say to the sand?

Spoiler:

Lame or whatever, just get one in!^^

So, I'll start. The first theme is Knock Knock