Long and short of it is, I don't know either.
Then again, here's what I have seen people do: they put as many clothes inside the machines as they possibly could have _forced_ in.
To the point that at the end of the cycle, clothes on the top are *still* on the top and *dry*. Sometimes, as the water is filling the tub, the lid of the machine opens a fraction of an inch and then lid moves as the clothes are agitated.
I wouldn't put past the clothes to "decide" to fly between the top of the machine and the tub when the basket starts spinning, seen as they are clearly above the tub rim anyway and there's nothing there to hold them, and then fall on the bottom of the machine.
Then again, I've never opened the machines to check for that.
Have fun!