"The Life Saver" - Taught as a standard part of motorcycle and cycle training, this is a last quick look over your right shoulder before committing to a right turn.
The idea being that you're riding along, you're coming up to a right turn, you look over your shoulder, signal, manouver out to the middle of the road. Now comes the dangerous part, as you're rolling along or even stopped in the middle of the road, there's a high probably that some very important moron in a car will see you and decide you've held him up just enough and PASS YOU ON THE RIGHT!!!
The life saver is that last second check to stop you going under the wheels of the car.
This happened to me this morning. I'm rolling along quite quickly, about 20mph, look over my shoulder, there's a Naravo or whatever they're called quite a way back, I signal, move out. Another check over my shoulder and the pickup is still some way back, I've still got my hand out by the way. No other traffic about so this should be no problem. It should be noted I've not yet actually held up the car.
Approach the turning, life saver... VROOOMMM! The fat knobber has passed me on my right. I almost went as well, lots of wobbling, lots of angry shouting, maybe a couple of fingers. Naravo brake lights go on. AWESOME! I jump on the pedals and chase after the knobber but as I reach him he floors it off.
Do the life saver kids. It's called that for a very good reason.