Season 1, Episode 7 of Mythbusters. They built a gun that would shoot pennies at terminal velocity and shot each other with it.
On a personal note, in the 90’s, I attended a basketball game at the Kingdome in Seattle. After the game, I was waiting outside the stadium and someone dropped a quarter from the ramps circling the dome. A quarter has more mass than a penny, and even though the Kingdome is only 250’ high (and the ramps were at least only 2/3 that high at the top, it gave me a cut on my forehead. Whoever threw it made a really lucky shot.
