Some people believe it's only good luck to pick up a penny if heads is showing. A penny with the tails side up should be turned over for another person to find. On the other hand, many people believe any penny you find is good luck. You may hear people repeat a common rhyme to this effect: "Find a penny, pick it up. All day long, you'll have good luck."
You might have little round sandwiches in your pocket... Most of our coins are metal sandwiches. The outside layers are three-quarters copper and one-quarter nickel, and the "filling" is solid copper. Pennies are made of zinc coated with copper. Only nickels are one solid material—that same 75% copper/25% nickel alloy. Would you like fries with that?
Along with the first U.S. penny’s design, the phrase “a penny saved is a penny earned” has been attributed to Benjamin Franklin.