The last one

Why is it considered impolite to eat the last one of something? It could be the last piece of pie, the last pickle in a jar, even the last chip in a bowl. It seems to take on some psychic weight, as people avoid it and wait for it to, what, disappear on its own? Sometimes someone will even make a general request for someone to take the last one, but they won't be the one to do it. Maybe the most prominent case in my own life is Michelle's family. When i lived with them, they would leave the last spoonful of peas in one dish and the last slice of ham in another. i ended up finishing most of the dishes off. i'm not sure who finishes them off now. Sometimes it seemed like if there were twenty-five skittles in a bowl, and i took twenty, whoever was eating the skittles with me would take four. i realize that it isn't a big deal. It's just a minor pet peeve of mine. And i do behave in the same manner myself, from time to time. So, the next time you see one of something left on a platter, ease everyone's righteously abstaining angst and just take it.