Once I was revving up a chain saw and the chain broke and flew off the chain saw bar. It came off the bar in a J shape then it straightened up and flew as straight as an arrow towards my son who was about 30 feet away. It was probably flying threw the air pretty fast but it seemed like it was all happing in slow motion - seemed like an eternity standing there watching it fly threw the air and wondering if my kid was going to get cut in half luckily he wasn't hurt. Cheers