Open house casualties, continued

There's a funny smell in my house and I can't seem to track down the source. I'm fairly certain its appearance followed the open house. I've checked all of the usual suspects: took out the trash, washed the dishes, cleaned out the refrigerator, flushed the kitchen drains, checked under the coffee table for B's vomit. But to no avail. I'm a little bit afraid that a month from now I'll find out that one of my guests mistook the plant pot for a food receptacle or that I inadvertantly stuffed some plates of hors d'oeurves in the coat closet.