Premier Date: August 5, 2005
Sharp objects or objects with masses over 3 lb. (1.2 kg), like a bowling ball, can be deadly if they fly forward during a crash. Lighter objects like tissue boxes may cause injury but cannot kill.
This was revealed when they crashed the real car and Adam pointed out that the box was intact.
While it is certainly possible to rear-end an arrow with another, only a fiberglass arrow can be split down the middle (known as telescoping in archery circles). With a wooden arrow, even under the most ideal conditions, the best one can do is a partial split along the grain of the wood, and even that is improbable. They clearly showed that the film’s circumstances can be recreated using a hollow shaft, such as bamboo.
(This myth was revisited in episode 51 and it was re-busted.)