Amnesia

The only place to hide is behind the big metal pannel the guy's strapped to. You slip behind it just as the men enter the room. You hear their voices.
"...but a hammer, I mean isn't that a bit crude?"
"Hmm... yeah, I see what you mean."
You hear what sounds like a guy chucking a hammer. The only poblem is, he chucks it to where you're hiding. It comes down and cracks you on the head. You yell out and collapse on the floor. The last thing you hear is "Hey, what was that?" Then you black out.