I am one for shouting in the safety of my own car as I tend to avoid confrontation like the plague, but over the weekend I realised I was in the wrong lane so I indicated left and waited for a suitable gap then pulled out. The car that I pulled out of took exception to this (despite not needing to change his speed) and flashed at me. I would always leave this be but we both ended up parking in the same supermarket a few rows apart, as he passed my car he muttered something like 'ill get you next time' under his breath. Again I let it go.
then whilst i was fiddling for a trolley token he muttered 'knob' under his breath at which point I turned to him calling him out, calmly stated the facts about the situation and that if he wanted to 'get me next time' he was more than welcome to try. I walked off and he stood there embarrassed in front of a handful of other shoppers.
Fully expected a keyed car on my return but it seems he thought better of it.
The point is, like P3T3R pointed out above, there are certain weird layouts and sudden lane changes that catch even locals (me) out but people love to get aggressive towards people who make those mistakes!