Re: Pssst
John Cleese (who may have invented the line in an episode of Fawlty Towers, he certainly used it) tells a story of being recognised in a German airport, and some large German repeated the line back to him whilst laughing his head off. Apparently it's one of Cleese's fondest outcomes from the whole Fawlty Towers thing.
I think we underestimate their capacity for appreciation of Properly Funny Stuff!