Name yours, the ones you like to do and the one everyone tries to do but kills everytime
Robbie Williams - Angels. When any guy tries to do this song, they always end up screaming the chorus(obviously the alcohol helps that).
You've got the classics like blues brothers, grease etc, fairly easy to do and everyone joins in.
I think the Monkees - I'm a believer is a always a good one to do.
The cheesier the better