Reasons to honk your horn in India

This is a list that I started to compile in Delhi; the noise of the traffic is at the front of your awareness all the time there. It's not nearly so bad here in comparatively quiet Manali, but many of these reasons still stand!:

1. To warn possible approaching traffic that you are going round a blind corner (usually where the side of the road is a sheer drop)
2. To warn cars (if you're a bus/lorry)/rickshaws/motorbikes/pedestrians/cows/donkeys/sheep/dogs that you're coming up behind them and need them to get out of the way
3. To let any of the above know you are passing them
4. To 'thank' any of the above for letting you pass
5. You ARE any of the above and want to signal back/show your annoyance at the vehicle which just passed you
6. You are about to drive past someone you know and like
7. You are about to drive past someone you know and dislike
8. You are about to drive past someone who is white, particularly if they are female
9. You are impatient and the vehicle in front of you failed to move off just a split second after the lights have changed/the road is clear
10. You're not sure whether or not the vehicle in front of you has noticed that the lights have changed/the road is clear
11. To tell an oncoming vehicle you will let them pass on a narrow road
12. The vehicle in front of youhas 'blow horn' painted on the back, and it would be rude not to oblige
13. You're in a bad mood
14. You're in a good mood
15. None of the above opportunities seem to have presented themselves recently, and you think you should just check if it's still working!!!