How many balls of string would it take to reach the moon?
Just one if it's long enough!

What cheese is made backwards?
Edam?
This match won't light!

That's funny, it did this morning!

What do elves do after school?
Gnomework!

If Ireland sank into the sea, what county wouldn't sink?
Cork!

How do we know that the Earth won't come to an end?
Because it's round!

How did your mum know you hadn't washed your face?
I forgot to wet the soap!