There's one I like where they're having a conversation, but every now and then they mishear a word as a name. It's cleverly done, but the payoff is where Barker says something along the lines of: 'Oh, I can't stand to be anywhere near that man's moronic orbit'. To which Corbett responds with 'Ronnie Corbett?' Nicely done, but haven't seen it for years.
http://www.youtube.com/watch?v=cc3M1nppd3c
http://www.youtube.com/watch?v=5c4uMaJKt_g 
Comments
2) telephone call
3) fork handles
'Oh, I can't stand to be anywhere near that man's moronic orbit'. To which Corbett responds with 'Ronnie Corbett?'
Nicely done, but haven't seen it for years.