I sadly spend a lot of time in airports... if you **** them off once they don't forget. I presume your name gets a mark against it so when your passport is scanned in they take the **** a bit. A colleague left his laptop in his bag and then made a joke about it in a German airport...he's been frisked and had his bag emptied EVERY time since when in europe.
The americans have a serious failure in humor too. My girlfriend flew to New York a month or so ago and she was interogated when she got off the flight because she was sweating so she must have something to hide... it had been the most turbulent flight she has ever been on and she doesn't like flying FFS
