I realise that this has probably been posted on here multiple times, and probably by me as well, but c**ts that have no concept of how to indicate properly at a roundabout.
It's either nothing, leaving you to fucking guess where they might decide to reach exit velocity, or indicating right when going straight on, or indicating left when going straight on (note, not when they have passed the previous exit, just indicating left the whole time and going straight on), plus any number of other c**nty ways of acting when on what is a really simple part of the road.