Long time ago, I got stopped in the green channel at Heathrow and politely informed that I fitted the description of a known drug smuggler. All perfectly amicable and quickly resolved when I showed my airline ID.
Funnily enough it was the same trip where my mate and I had been hauled off the plane on arrival at TLV by a couple of swarthy guys with Uzis, in front of all the other bemused passengers.