I apologize if this is getting off thread but it is an interesting story. I visited Lane Phillips yesterday. He is 75, an ace bike mechanic and a former member of the ABB. He said that on bicycles the closed end of the clip should point forward and that he has known chains come apart when the clip was installed backwards. The failure occurs when the rider is shifting gears. The open end of the clip contacts a tooth of the the cog that it is switching to and the clip pops off. This probably explains the generally accepted practice of putting the clip on in the forward direction. Putting one on backwards could also cause a motorcycle chain to fail if the edge of the chain contacts or rubs against something.
76 Suzuki GT500
2011 Jaguar XKR
A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke