I don't know how to use doors. Not even the ones with instructions written on them. If they say "push" I pull, and if they say "pull" I push. I've been locked in, locked out and locked between doors. I can't easily find the handle to get out of my own car. Let's better not talk about keys and locks...
I'm not being particularly smart here, but it seems that the error is more common than I thought. And it seems that my stupidity is not the only cause.