Never. Although I have been on the receiving end when I've taken the inside lane to come off at a junction just before the queuing traffic when some tosser has decided I should wait in a queue for somewhere I'm not going. Luckily all the cars I've had (or my pig-headedness) have meant I've got around them quite easily by calling their bluff.
I've even been a witness to it...on the A50 when they were creating the new M1/A50 junction. Lorry in the L1 doing 20-30mph with the rest of the traffic in his lane, me in L3 cruising down from a previous 80mph to about 60mph as I'd seen the queuing traffic, van in L2 who I was overtaking until I'd slowed down. I slow down a bit more (no brakes, just engine braking), as I start to drop behind the van still doing about 50mph the lorry swerves out (not for any reason I could see) and the van has no chance to stop or swerve and simply ploughs into the back of the lorry. The back of the van (Luton type) disintegrates as it leaves the chassis and the front of the van disappeared under the back of the lorry. I slammed on, moved into L2 (more traffic behind me in L3) and stopped with my hazards on.
The van driver was VERY lucky as he'd hit the lorry slightly offset so he was injured but not seriously. The lorry driver got out shaking his head mumbling something like "Dozy fekker. Should have effin waited in the effin queue like the effin rest of us".
I gave my statement to the police, but was never contacted after that - and couldn't even find anything in the papers or on the interwebnet - so it must not have counted as a big enough incident to be worth reporting.