I have also heard of an occasion where the aircraft went off the side of the runway because some pillock had left an empty Coca Cola can underneath the nosewheel steering tiller and it jammed.
By the way, not only do we clean up after ourselves but we fit loose (plastic/leather) covers over the flight deck seats after flight so that the maintenance guys can sit down without having to worry about how much grease their bums have inherited during a long night of hard work.
It only takes a couple of minutes and it works well.