Not on Bread Alone

It's well understood within the division that any food left on the kitchen counter signifies that it's unwanted and free for the taking.  Chocolates and patries are not uncommon appearances.  Today around lunch, however, there stood on the counter (ok, sandwiches can't stand, so it actually sat) was one lone sandwich on a plate. 

An hour later, it somehow became just a top piece of bread on the same plate.

Somebody went through the effort of separating the sandwich, putting most of it on a new plate, and leaving behind the top piece of bread.  That seems like a lot of effort.  Which begs the question... WHY?  How is that ever easier than taking the whole sandwich?  Who's going to take the bread now?  I work with supposedly brilliant people, not just the docs, but everyone here, but... why?  What- huh?  This reminds me of the story of the stolen lunch meat, which is to say, it makes me happy.