We play Tetris at work sometimes. Sometimes, we go at it all day long. The trick to not getting caught is not a trip-wire or a series of animal calls down the office hallway, it's a pair of sunglasses. Using the reflection alone, you can spot anyone coming in as long as you're actively paranoid and enjoying the thrill of the chase - just try not to do it too often.
Here are a few ideas 



ha! I love it.
view maximumHOTbottom's profile
shiny sunglasses work best.
view chaseunchase's profile
I use a $2.99 convex blind spot mirror from kroger. Probably could find something similar at the auto parts store
view mr_c0w's profile
that is so awesome!
view kdkaboom's profile
I have one of these on my work computer! I picked it up from Target's dollar section (2 for $5!) about 2 yrs ago... it's my favorite desk accessory! I highly recommend SOMETHING reflective to ward of prankster coworkers or nosy bosses!
view areneetay's profile