Source: No Hope For the Human Race - Wall Photos
Stashed in: Mother of God!, Interesting
This made the rounds in 2011 and it's making the rounds again.
Don't do it on $26.86 though or you'll look cheap.
It's funnier if you do it on a receipt that's not a round number.
Mother of Pi.
It's all about patterns...
Gizmos Perfect Loop gifs
reforming math class
Mathematica on Raspberry Pi, for free