A friend of mine posted on Facebook that she just watched a guy drop a potato chip, pick it up, and eat it. OFF THE FLOOR IN THE AIRPORT. She said she guessed it was the 5 second rule.
After I got through barfing, I remembered a story my old boss told me that makes me giggle every time I think about it.
His 7 year old daughter had a playmate over one day. The playmate dropped an M&M, picked it up, said "5 second rule!" and ate it. My boss said "WHAT!? What's the 5 second rule?" She said "If it stays on the ground less than 5 second you can eat it."
He said "Where did you here that?". She paused, looking thoughtful, then said,
"I think it's in the Bible!".