What every video player needs: A button that rewinds the movie 10 seconds

What'd he just say? I totally missed it because

1) You were talking
2) I was talking
3) An ambulance was passing
4) The actor slurred his words
5) The actor has a thick accent
6) Something really funny happened
7) A mosquito flew by
8) Someone dropped a pen.

Instead of painstakingly dragging the playhead to the correct spot, which becomes harder the longer the video, just click the 'Rewind 10 seconds' button. Honestly, I'm so lazy that sometimes I'll just go on watching the movie or show without going back to see what I missed.

DVD players and their large, usually unorganized remote control, have the ability to skip back pretty easily - if you can find it. This idea is something I really want for all my online video players.

A keyboard shortcut would make it even easier. Moving the mouse ruins the cinematic feel by bringing up the player's interface and sometimes exiting fullscreen viewing. '[' , 'K', '<', could all work as keyboard shortcuts.

So. A few ending questions.

Is it already implemented somewhere? (i.e. did I just make a pointless post?)

How do I make this happen?