I'd add driving too fast or slow relative to the danger level. Saw a cyclist hauling ass down Dean Keeton a few weeks ago (westbound, all downhill coming from 35) going the same speed as me around red river, 35-40 mph bc she was pedaling fast as shit, not 1 minute later she runs straight into an SUV that turned right across her on San Jac. She must have still been going about 25 mph even after trying to brake. Felt bad, was probably the SUV's fault, but if you're on a bike you should ride at speeds relative to your ability to brake, and relative to the amount of danger being on a bike surrounded by cars entails. If I'm going 35 in my car I can brake probably half the time she can on her bike. And she paid for it.
Same with scooters, I hate that they're downtown on some streets without bike lanes and not blending into traffic like *responsible* cyclists would do. Had a couple squeeze into a lane with me scare the shit out of me. Should've just followed me, or even cut me off, at least I'd understand that, but I suppose the more accident posts we see on this thread will help in sorting out the dumbasses.