third-pounder

a special burger that McDonald's did in the eighties where a burger had of a had a third of a pound of meat instead of a fourth of a pound, which is why the burger is named the third-pounder. It turns out the majority of participants incorrectly believed one-third of a pound was actually smaller than a quarter of a pound, so it was briefly discontinued

1. wow this third-pounder is so big compared to the quarter-pounder!