Thieves, I tell you

So, you've seen the picture. The one with my nickname written with a black Sharpie on the white cover of my Poland Springs water bottle. This one here.

It not for reasons of vanity that I write my name on my water bottle. I do it so people other than those named Tim won't drink it. I usually bring two from home and place one in the office frig. Three times now someone has taken one of my bottles of water.