That is kinda what has passed my mind before.
Here's a picture to give you a better idea of what i'm chatting about.
Please note that to the left, about 6-8 car lengths away are traffic lights, so i'm not on about cars rolling in front of me in the hope the traffic in front will move off, because the lights are red, and the traffic ain't going anywhere.
That's when you get the slight turn of the head and they then think "Ooohh, i wonder if that chap with the balaclava and crash helmet on with the angry looking eyes making all that noise and pointing at me wanted to come out of that road that i just parked across on top of this big lettered Keep Clear sign?"