Snugster
Striker
Or don't indicate until really late when you could have been out but you wait thinking they're going straight on.You arrive at a T junction and you are going to turn right. There is a car coming from your left, it is indicating to turn right into the bit you are on. You think about pulling out but decide to be a good driver and stay where you are to allow them to make their right turn.
They slowly arrive at the junction and then, at the last moment, flash you out.
Why not do it from way back if that is your intention!
(And yes I am fully aware of the Highway codes rules on flashing your headlights)