Some of these situations are indicative of poor communications and lack of understanding of intention.
Simply saying: First plane going around, I am right behind you and will follow...waggle your wings so I know for sure you are the only one on upwind.
Non standard patterns, like a quick circle back to the threshold is worthy of a radio call to let others know that you are a bit insane or on fire and need to land.
Some will say: I can't possibly work the radio while circling at 50'. WELL DON'T do something stupid. Assume everyone else in the pattern is about to do something stupid.
Work em, think em, watch for traps. And there are traps out there. Everyone is sometimes just thinking of themselves, and therein lies the problem.