The motorway junction roundabout next to where I work is the kind with multiple sets of lights and a three lane arrangement where the left lane leaves the roundabout at each exit and the other lanes all shuffle over to create a new lane on the right. On many mornings I encounter people who have a hard time understanding the lane markings, perhaps they haven’t quite woken up yet.
This morning was like that. I was in the rightmost lane, another car was in the middle lane, the lights went green, and I followed the lane markings into the middle lane. Or I would have if the woman on the left hadn’t decided she wanted to be on the spot of road I was on. I braked, honked, fell in behind her, wondered how someone could consider crossing dashed lane markings without signalling an acceptable way to drive, and forgot about it.
See for yourself using my badly drawn diagram. If you wanted to get to X, would you start from lane A, B or C?

Then the woman drove into the car park of the place I work. I briefly considered asking the receptionist who she was, but there were visitors in the foyer so I decided it wasn’t important. Until she phoned me up. “Are you Rob Fisher?” Yes. She explained how she didn’t mind being beeped when she was wrong, but that she had been taking that route around the roundabout for three years, so obviously it was me that tried to drive into her lane! Three years?! It’s kind of understandable if you encounter that roundabout for the first time and get it a bit wrong, but surely you would notice if you’d been hustling people out of their lane for three years? I explained that she had crossed lane markings without signalling, she suggested we both look closely at them next time, and that was that.
Anyway, although I’m referring to a specific incident, plenty of people successfully annoy me in this way. If you want to annoy me on the road, simply don’t bother to to look at the lane markings and randomly change lanes. For extra effect, change lanes several times. To make sure you get me, do it wrong every single day for years on end, it’s bound to be me you carve up eventually. Finding yourself in the wrong lane, checking there is enough space, signalling and then changing lanes in front of me will not annoy me, that’s not good enough. Being an unpredictable idiot will. Keep working at it!