When confronted with obvious or rhetorical questions be sure to answer sarcastically or ironically. E.g. if you’ve been to the hairdresser’s and a colleague asks “Oh, you’ve been to the hairdressers” simply answer “no, I haven’t!” Your colleague will be honestly confused with your answer as it is obvious to him you have had your hair cut.
Let the matter rest for a while and bring up the subject a little later. “I read in a magazine, while I was at the hairdresser’s yesterday, that…” Your colleague will probably not take you up on this but you can rest assured you have portrayed yourself as a mysterious and unfathomable foreigner who stands had and shoulders above the cross-cultural incompetence of your target.