Pebble

I usually get into work around 6am. This morning when I arrived, I saw a sign on the glass doors in the lobby saying "Use Side Door", I figured the lock was just being temperamental.

I put my key in and turned it.. and it STUCK in the lock. So, around to the side door, come inside and try to turn the lock from the inside...

Now the keys are in the front door, and I'm inside at least. Next find a pair of pliers and go back out to get the key out without breaking it off in the lock... success!

Looking at the door with my analytical, but not mechanical mind, I can tell that the two doors aren't lining up in the frame...

Assume that the problem is with the door or the hinges, etc.. get it to unlock so we can use it at least.

When our design engineer gets here, I ask him if he can check it out for me.

He comes back in.. and says he fixed it. THERE WAS A PEBBLE stuck in the door jam!
Reason 10000000 why I'm not an engineer :)
Always some rock to move before you can really get to work.