My kids were arguing once and my son turned round to his sister and called her a "fluffing retard" (my son was 5 and is Autistic). When I asked him where he heard this from he went silent, so when I dropped the kids off I asked my ex had anyone used this sort of language around him. I knew full well that neither me or her would ever call him that, but I didn't know her new partner at the time, nor did I like her brothers very much.
Anyway she phones me a few days later and says she found out who said it. I asked who, and she said me! The full quote that my boy had heard was "Indicate you fluffing retard"
Picture the scene, driving along a stretch of dual carriageway @ 40mph. Driver in the outside lane doing 30mph pulls in front of me forcing me to really heavily slam the brakes on and throwing my kids into their seatbelts and launching a milkshake in my daughters hand all over my carpet. Cue me shouting "Indicate........."
So Maggot, I agree, non-indicating drivers should be shot in the face with a nail gun!