I think all kids eat scabs at some time, we had a kid at school who had a big scab on his knee and kept it in an empty matchbox to show the world. we used to have a teacher at grammar school too,who used to pick her nose in class and roll it in a tiny ball and either eat it or flick it at the class we used to call her "pick it flick it", I think the two worst things are people who pick their nose whilst waiting in their car for the traffic lights to change or people who blow their nose and then open the tissue/hanky and examine it. ughh.