You've certainly heard of tinfoil hats.  The idea, I suppose, is similar to a Faraday cage.

Well, two guys in Santa Catarina, Brazil, took tinfoil to new heights.  Or should I say new lows, since they crawled around on the floor inside a bank trying to avoid heat-sensing radar.  You know, the kind of heat that tinfoil blocks.  Along with government surveillance and aliens.   

They were trying to rob the bank, wearing tinfoil suits from head to toe.  Great planning except for one thing.  They forgot about the video cameras.  Go right ahead and enjoy those two minutes of stupidity.  

Now if they just had an invisible cloak.