People who swing out to turn into junctions and things. It makes me mad, especially when they do it at roundabouts because their poxy fiesta is so wide they'll clip the rear wheels when making such a sharp turn...
I live in Haydon Wick and when I drive past this traffic calming measure it never ceases to amaze me how people's desire to make a counter-turn prior to a turn can pickle someone's brain.
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See the silver Clio? For some reason when some cars head towards that point (in the direction of the clio) they pull to the left before then turning right and stopping. That makes no sense.
Why, when you need to turn your wheel to the right to go around something, pull to the left first? Sometimes it's even more extreme when they're coming to a stop because a car is coming from the other way. I've seen numerous people pull into the junction (to the Clio's left) and then out again, so the front and rear wheels are almost parallel to the angled curb they should be going round. How that makes a turn easier I don't know. Although I suppose they could turn more to the right, before turning left around the traffic calming just in case.