Can a small block timing chain jump a tooth?

A lotta the old engines, when they "ran-on", usually with a big puff of smoke outta the air cleaner, are actually running in reverse rotation, and will walk an old, stiff, stretched timing chain over a tooth, or plastic coated gears, same issue.
I know, there are going to be many say it can't rotate backwards, but thru the years I've seen it a couple times with my own eyes, and others as well.
So yes, it can jump a tooth, usually hi-milers.