I once had friend who was taught how to play a killer game of chess by someone from Eastern Europe. It appears he had a Czech mate.
I got my own back by sharing the story of the chess conference that was taking place in a big hotel, where at the end, all the attendees were standing around in the hotel entrance bragging about the matches they'd won, but the hotel manager chucked them out 'cos he couldn't stand chess nuts boasting in an open foyer.