I have a perspective here that's a little gross, so I am going to white it out. This probably has nothing to do with the OPs coworkers, but you never know. Warning! It's gross.
I work in a dog grooming salon and have for a long time. When some dogs urinate, it smells exactly like microwaved popcorn. In several different salons, with many different people, this is something that is regularly commented on. I have had customers say it also.
A lot of people don't know what that smells like, because their dogs probably potty outside. Also, not every dog will have that smell and a spritz isn't enough to make that smell. It has to be a puddles worth.
So, maybe that's why?