One may not honk another’s horn.
10.32.100 Climbing into another’s vehicle, sounding horn, etc. prohibited without permission. No person shall, without the permission of the owner or person in charge thereof, climb upon or into, or swing upon any motor vehicle or trailer, whether the same is in motion or at rest, or sound the horn or other sound-producing device thereon,…
It is illegal to request for someone to “watch over” your parked car.
10.32.010 Vehicle watching or guarding prohibited. It is unlawful for any person to solicit the privilege of watching or guarding a vehicle while parked on the streets of this city. (Prior code § 21-19)