I used to be an operating theatre nurse. As a general rule, we provided our own lunches, but if we were involved in a long case, that went over lunchtime, Sister would order in sandwiches, and would bag up a round each for the nurses, who were always last out of Theatre, because we had to clean up, wash and sterilise the instruments etc. The surgeons finished the operation, and walked out.
There was one junior surgeon (a house officer), who used to eat the sandwiches provided for him, and then nick the packs of sandwiches left for the nurses. He had no excuse - the bags had the names on - he was just a greedy fucker.
I remember coming out of Theatre, after a really long case, having finished the cleaning, and long past lunchtime, starving hungry, to find a solitary slice of tomato in the bag with my name on. Bastard.