I drive around 120 miles a day. I see stupid human tricks ALL the time.
Not using indicators is an everywhere thing. Here in the land of Ma$$holes the big things are passing at high speed in the right hand lane and tailgating. The newest brain-dead stunt to hit the streets is driving 100+mph during rush hour.
Where I live, people don’t use their turn signals to change lanes because all it does is make the people behind them in the lane they want to go to, speed up.