[zachrose]

Sure, but maybe you could think of POSTing to /honks as "creating a honk."

This would make sense if you wanted to GET /honks and see a collection of previous honks. (Modifying an existing honk doesn't make sense, so we wouldn't have to worry about it.)

[shawnz]

I think this interpretation is the best fit. Similarly PUT would be appropriate for requests where you are specifying the time that the honk should occur, which would make them idempotent.

[andrewstuart2]

I wouldn't mind performing GET /vehicle/{id}/honks?since={time}&limit=1000 to see an indicator of how aggressively my car has been driven. Especially if somebody else is driving it.