So yeah, on the way to work today..i was in the fast lane doing 70mph. Some guy in a black Audi A4 joins the motorway and cuts across all 3 lanes directly in front of me. I put my hand up (palm upwards) like a "what the hell" jesture. He flips me the finger so naturally i do likewise.
Then he slams on the breaks to 50mph while looking back at me the whole time and i can see him holding something up. I undertake him slowly and just avoid looking at him. He drives up along side me with his window open shouting (and i mean frothing at the mouth shouting) at me while holding up his open wallet. I only look briefly as the motorway is congested and all i see is his pink driving license so i carry on. He speeds up slightly to look at my number plate, then speaks into something (like a mic but probably his cell or wallet) as if hes calling me in.
He pulls in front of me trying to get me to pull over onto the side of the motorway by slamming on the breaks and getting close to my front wing. I turn off the motorway as it was my junction to get off at anyway and he followed in front. Luckily the traffic lights ahead were green then he sped off.
Sadly i didn't get his full license plate so i don't know if he was undercover or just some crackhead.

Anyone had any experiences like this?

CORE version: Guy cuts me up on the motorway, gets pissy, pretends he is or is an Undercover cop, tries to push me off the road, then he fucks off.

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