About five years ago (back when SYD-YVR was only seasonal) I was denied entry in the YVR BA lounge (travelling QF) as he said "the lounge is at capacity". Unfortunately for him, the lounge was designed that I could see that the lounge was completely empty (The QF flight was a few hours before the BA one) - and when further questioned, he pulled out at sign that said "Lounge has reached capacity, sorry for the inconvenience" to which I said "I can see the lounge is completely empty!". He then gave up and let us in.
But once in we asked where the showers were, to which we were told there were none - so we finished our G&Ts and went to the QF designated lounge (I think it was plaza premium or something), and was probably better than the BA lounge in all fairness.