I've just realised that of all the scripted comedy I've ever watched in the world I've never laughed longer and harder than at the impromptu skits of Colin Mochrie and Ryan Stiles on Whose Line is it Anyway (the UK version!).
+1 for Who's Line Is It Anyways. I mostly watched the US Drew Carrey version, but i can honestly say that ive never cried so much in my lifetime. tears of unbreathable laughter