A couple of old fogies down in Tunbridge Wells, "I say old chap, how very uncouth." Meanwhile everyone else, "It's been almost 50 years since Fawlty Towers. Took them long enough."
I was on a theatre tour (as Technical Director), the show had ended, it was late and night and everyone was tired after a long day and packing everything away. The German host gathered us together and stood on a chair to tell us about accommodation arrangements.
He was clearly your stereotypical, humourless, German. He introduced himself - "Hi, my name is Hans. As you can see, I am German". Short pause, then in a loud stage whisper "Don't mention the war!".
It was SO unexpected to have any humour at all, let alone self-referential Fawlty Towers reference. There was a pause while all the tired people processed what they'd just heard and then absolutely dissolved in laughter.