Direct quote from my teacher today: "Bob says it's going to fit, while Anna says its too big to fit".
Now, what he was talking about: Special relativity. Bob thinks the space ship that is going at ~.8c will fit in the barn, while according to Anna (who is on the ship), the ship is too big. Also, according to anna, only the first 1/4th will fit (just the tip). It was even better with the diagrams.