Ah headlights in the rain, that's a good idea, I nearly moved into a Merc the other day, it was pissing it down (and I mean really hard!), no visibility so I indicated and started to move & then suddenly realised that there was a silver merc with no lights on doing about 95mph that I nearly hit because he was nigh on invisible in my mirrors, and he had the cheek to call me a ****er as he went past!