I love Fawlty Towers. My favourite was where Basil was hitting his Austin 1300 with a tree branch!

Also the episode where Manuel's arm is on fire!!!

Another absolutely fantastic comedy series was Porridge. Unfortunately I don't think many people out of the UK saw this series, I found it more funny than Fawlty Towers.
Blackadder is a favourite too.
Queen: There's definitely been no sign of Edmund.
Percy: I fear not, Ma'am.
Queen: Why he vanished? Simply vanished...
Percy: Like an old oak table...
Queen: Vanished, Lord Percy, not varnished.
Percy: Forgive me, My Lady, but my Uncle Bertram's old oak table completely vanished.
'Twas on the night of the great Stepney fire. And on that same terrible night, his house and
all his other things completely vanished too. So did he, in fact. It was a most perplexing
mystery.
Queen: Lord Percy?
Percy: Yes?
Queen: It's up to you: either you can shut up, or you can have your head cut off.
Percy: (squints, thinks very long and hard about it) I'll shut up.