I spy with my little eye....

Look behind you.  Right......THERE!
No....RIGHT THERE!
THERE!
What?  Didn't you see it?  I totally did.  Because I found these nifty glasses that have mirrors on the inside, like rear-view mirrors on cars.

(source here)

My favorite part of this picture?  The newspaper's headline is 

"And then there were seven."

dun dun DUN!

If I ever saw someone actually wearing these, I don't know if I'd spend all my time trying to figure out what they were looking at, or whether I'd plop down behind them and confirm their worst fears:  that they're being followed.  

Bwahaha!