Towerman - if you do all that then they would get very suspicious of you and why you are there.
As for bad/overly officious customs agents/passport controls, the worst I've found aren't actually at airports but at London Waterloo International, Paris Gare du Nord and Brussels Midi Stations where the Eurostars operate to/from .... they think that because they aren't at an airport they can give passengers one hellish time.
Jordan