DH has a strange habit where if he drives past a car which is the same colour and model as ours he flashes his lights at them - the "car twin".
We have recently got a new car and it seems quite common and this habit is driving me a bit mad - mainly because he insists everyone does it and people will know why he's doing it. I've told him no one else does it and he's confusing other drivers.
Does anyone else do this?