Picking up a penny is supposed to be "good luck".
One day, on my way to work, I stopped at a gas station to get a coke. On my way to the cashier I noticed a penny on the ground and picked it up, thinking, this will be a good day!
Five minutes later I arrived at the office only to see the events unfolding on September 11, 2001.
I have not picked up a coin since.