Is It OK To Eat Half Of A Donut And Leave The Other Half In The Box [POLL]

Almost every week we get a visit from Doug Maughan at CSI. He usually brings in a student to talk with us and share information about upcoming CSI Events. He also always brings in a box of donuts - which makes us like him even more! Well, this morning I came in and saw the box of donuts and went to get one and right there on top was half of a donut. Someone had cut the donut in half and left the unwanted portion on top of the other ones! I don't know if they were worried about calories intake or health reasons or they didn't want to seem like a porker - but on the flip side they left half of a donut in the box! I don't know if they touched it, sneezed on it, licked it, or if it is fine...but I know it is weird! Right? Who does that? I'll have you know though, I quickly corrected the problem before anyone else had to worry about it. I ate the half a donut and then took another :)

Do you think its alright to cut food in half and leave it for somebody else?