Once on a STN-SXF flight I was waiting in a queue with barriers, and an older German woman went under the barriers to the space right in front of me. I was astounded but didn't think it was worth saying anything for one person. Then her husband did the same thing.

Me: Excuse me, there's a queue.
Him: I'm just joining my wife.
Me: She jumped the queue too!

It was his "explanation" that was the amazing part, since he watched her jump the queue immediately before!