Speaking of the little details that make GTA V so great, here's a video that answers questions I didn't even know I had.

Like, does a helmet actually do anything to protect your head? Can a car run out of gas? Can a car that's run out of gas still explode? If a tree falls and no one is around, does it still make a sound? You can thank the people at DefendTheHouse for putting these theories to the test. Except maybe that last one.