The man was sitting in a convertible; as he proposed to his girlfriend who was on the balcony above she accidently bumped into a flower vase while leaning over. The flower vase fell perpendicularly onto the man's head, instantly killing him.

( hell, we took some time to come up with something like this ) 

(The other one about 'the twig' will really knock your socks off.)

- Anil Damodaran and Pradeep Kumar