Tangency

In their downtime, the Big Bang boys often like to kick back with comic books, video games or squirreling away their spare cash in the hollowed-out buttocks of Green Lantern action figures. Being the brilliant men they are, though, they sometimes prefer more intellectual pastimes.

In one memorable instance, Sheldon and Leonard are engaging in a little three-dimensional chess. Unsurprisingly, Dr. Cooper makes short work of his opponent, before rubbing salt into the wound by quipping, "it must be humbling to suck on so many different levels." With the three-dimensional nature of the game, it's a clever little science jibe that those of us without advanced knowledge of physics can grasp.

-screenrant so I don't get a lawsuit