Ahhh, Perth! Took a student there a while ago for some experience away from base. Planned for an OHJ and as we did so it became clear the "runway in use" was 33 but there was a solo student (not cleared for grass) taking off from 03 to depart to the east from the overhead on a navex and a microlight opting to depart from 27. We managed to let the departing student climb safely through our level in the overhead then positioned for 03 (my student also not checked out on grass), avoiding the 27 departure. As we called final 03 so did someone else for 33 - on a constant bearing to our right. A game of chicken then ensued, which we lost by going around (but TBH I'm not convinced the other guy was playing - the evidence pointed to him being blissfully unaware of our presence).
All good clean fun although my student wasn't as amused as I was
