We were in Dubai recently, queuing for a ride at a waterpark.
The queue was quite long, and we were behind three girls. As we snaked up, we suddenly registered that there was a group of Spanish people in front of us, whose friends are coming up from behind and ducking in and out. Clearly queue jumping.
DH, who's never been one to shy away from confrontation, called them on it, and they obviously denied it vehemently.
But the funny thing was that the guy from the group behind us jumped in to agree, and ran off to get a member of staff, and then the three girls ahead of us who we'd previously been behind, were saying, 'hang on, those people were right behind us before'.
So the queue-jumpers totally got called on it, and had to stand back while everyone they'd jumped demanded to go ahead of them.
It was an international queue d'état, and it was massively satisfying.