I plant pennies heads-up throughout my home and in the wild because of the commonly held superstition that finding a penny on heads is good luck and/or allows you to make a wish.
I like to think that every heads-up penny makes someone feel a little bit happier.
In our house, Charlie accompanies these discoveries with, "Find a penny. Pick it up. All the day you'll have good luck!"
Happened twice yesterday. He was so happy.
Makes me a little happier, too.