I like all kinds of humour; Bill Bailey is (currently) my favourite comedian, though in the past I have been fans of (in order); Morecombe and Wise, The Two Ronnies, Jasper Carrot, Lenny Henry, Jack Dee.
My favourite kind of humour is improvised; the programmes (and comedians) that get me laughing so much I can't breate are; Whose Line, They Think it's all Over, Nevermind the Buzzcocks and the Chris Moyles Show, especially when things go wrong (I can pick favourite moments from all these shows).
I also like humourous books (Hippo Eats Dwarf, Eats, shoots and leaves and the discworld novels).
Also funny songs... I could go on forever.