re: Light turns green, person in front doesn't move, how long til you honk?

A few years ago when eldest son first started driving, he was caught behind some old man waiting out a green light. I reached over and honked the horn and ducked down in my seat. My son was beet red and said that the old man flipped him off. He couldn't understand why I ducked down and started laughing.

I've moved way past honking at green-light stragglers.

If someone is on their phone at a red light, I honk just to watch them take off and run the light.

Doesn't always work but I've seen some hairy situations ensue. IDGAF.