Road Warrior Secret

I travel a lot for work.  You know this.
When one travels a lot, and stays in hotels a lot... one can tend to forget which room one is staying in on said trip/night.

So, I came up with a little trick so that I'm not sliding my hotel card key in the wrong door (anymore).

That's right. The second I check into my room, I take a picture of my room number with my phone. Go ahead, steal it. It's genius. I know this.