When I went to Legoland with my other half in June, we witnessed an attempted queue jump - by a group of obvious traveller kids on the Boating School ride. They were "trying to find their mum in the queue" apparently - us, a particularly annoyed woman and her husband behind, and a group of Indian chaps succeeded in not letting them get past - and when we got to the front, the woman informed the Ride Op what they had done - and the Ride Op then checked with us quietly to check she was telling the truth - he was a bit gutted that we backed up the story because he knew what he was about to have to deal with, the poor chap!
Needless to say, after we pulled away in our boat, we didn't see another boat behind us for the entirety of the ride - reason being the kids were kicking off on the loading platform and refused to leave. We really really felt for the poor guy who was operating the ride but fair play for not letting them ride