Can't list all of them, that would take yonks!
His bluntness & sarcasm is what makes him so funny in a house full of fakes.
Mikey...on mice & whether they eat cheese: “Ask Rex. His restaurants are probably plagued by them”
On guide dogs: "when you get home you just put it in the cupboard"
On the public perception of Nicole:
Rex: the public don't like single girls
Mikey: perhaps they won't like the Nicole-type of girl
Nicole: and what type of girl is that, Mikey?
Mikey: high maintenance girls who are up their own arse....
Even his sneezing is hilarious :
http://www.youtube.com/watch?v=5s4lOA7HHIw