Numpty in a tipper truck took exception to my overtaking him as I was filtering, and then kept pace as the traffic found a happy speed of 20 mph. Me - about three bike lengths from the car in front, and holding it. Him, 2' off my rear wheel to start with and then goes for an utterly pointless and really threatening overtake.
I'm sorry, I've had a long easy Summer with the last week spent on the untrafficed lanes of Sussex, and all I could do was look over my shoulder and bellow at the top of my voice, repeatedly, "FUCK OFF FUCK OFF FUCK OFF" whilst he responded in kind and gesticulated violently that I should be in the gutter.
Not very mature or helpful I grant you, but I was really angry, probably through being intimidated by a twat behind the wheel of a ten tonner (or whatever they are).