I bought a whole bunch of pennies once: 1,024 of them. I flipped every blessed one of them ten times in a row. One of them (as you might expect) came up heads all ten times. I kept that one for good luck.
One day, a friend wanted to flip for something. I said, “okay, but only if I get to take tails.” I took my penny out of my pocket and handed it to him. The fool! He flipped it, thinking that, since it looked, weighed, and felt just like every other penny he’d ever handled, that it was a 50/50 chance.
Another completely false story
Once, a friend of mine bought a whole bunch of pennies (512 of them) thinking he could flip them each nine times in a row and that one would certainly come up heads all nine times, and then he’d have a penny that was “primed” to come up tails. Turns out there was a light breeze that day, and he had two pennies come up all heads, nine times in a row. What luck!!!
I purchased them both from him for $0.10 each, knowing their value, and took them out to a party, where I decided to win some bar bets with them. The first one worked just like he said it would!!! I won a beer off some poor schmuck who didn’t realize my penny was “primed”. Then, when I tried the other one, it failed me – it came up heads. I owed the guy a beer.
I went back to my friend the next day demanding my ten cents back, and he said “What do you mean, you fool? You paid me ten cents each for pennies that had come up heads nine times in a row. You used one of them up, but now the other one has come up heads ten times in a row!! If I only had $0.20, I’d buy it back from you!”
I walked away, even happier with my purchases – I was down eighteen cents, even on beers, and I had the ultimate betting penny.