I was at a restaraunt and there was a clipboard filled with people's names and a number next to the name. I wrote "Miller 2", set the clipboard down, and waited. Some of the names and numbers were scratched out - I assumed they were the ones I could see eating where my wife and I would be eating too soon.
As more people arrived, we just watched. Some stared flummoxed. Others looked around. Some said "What do we do?" Others said "Are we just supposed to sign this?" Others "Is this how you get your name on the list?"
Sometimes it's just that simple and makes that much sense. But we've been programmed differently and if it doesn't fit our programming we suddenly on't know what to do, even though what to do couldn't be more obvious.