Littering. Driver threw a cigarette out of window ignoring traffic behind.
Perhaps learn to drive in a straight line too. You may have just passed your test and think it's okay to drive like an idiot because your car is full of teenagers, but it isn't. You won't last 5 minutes like that.
Left a dog in the car during a heatwave. Luckily she turned up before I had chance to take action myself.