Came back from a business trip yesterday with a co-worker....the time between our connecting flights was very tight, and we ended up needing to go running through the airport to get to the gate in time.
Got to security, and my co-worker, whom was in front of me got detained because he was carrying a sealed box of liquids that he'd bought in London airport. So my co-worker and the security man got into a discussion about about the correct procedures of carrying liquids onto a flight (we got through the first airport without any problem). My co-worker opened the box, and started to put the items into his clear bag, but for some reason the security man took offense to that.
At this point, getting really worried about missing our flight, I called to my co-worker by name and handed him my clear bag (which was emptier than his was), my co-worker thanked me by name, stuck the stuff in the bag, and gave it back to me. At this point, the security man allowed my co-worker to pick his stuff up and go through security, but then stopped me and asked "Are you two travelling together?" "No, we were just standing next to each other, and calling each other by our names. I've never actually seen this man up until five minutes ago, and for all I know he may well be travelling to a completely different country to me". I didn't actually say that, but it was starting to feel like the security man was doing his best to hold us up.