The 'Four Jokes'

It is said that ALL jokes can be broken down into a combination of the following.

1/ Incongruous or surprising
2/ Puns and plays on words
3/ Exageration
4/ In jokes

Can you find one that does not?

Ok - I can't resist trying to give a one line example from memory of each.  I challenge my readers to come up with four better one liners (which shouldn't be difficult

1/  How does it change many dyslexics to take a light bulb?
2/  Famous football result - East Fife 4 - Forfar 5!
3/  I've told you a million times not to exagerate!
4/  Fusion power is 30 years away and always has been.

(Incidentally, there is a credible answer to the last one!  Must post it in the next week or so.)