Recently on holiday on a Caravan site:
This particular shower block has 5 showers. Decent sized, with benches. Not a tiny cubicle, can easily fit 3 people. But still, just 5 showers.
Nan, mum, child are next up... All wearing swimming costumes (so not going in naked) mum and child go in, nan waits for the next shower. Mum sends the kid out of the shower to go for a wee (round the other side of the showers)
Meanwhile, a shower becomes available. At this point there are probably 4/5 people waiting. The next woman in the queue and her child go in.
The nan then complains to the mum that her place in the queue has gone, she is going back to the van etc and the mum has a go at the woman (through the stalls) for jumping the queue.
Who is BU?
Should she have waited and let the nan back? Bear in mind it was tea time and there is a queue of people waiting