With the declining hive population, the SHB's will take over and lay eggs all over the place. Once those hatch the maggots get into the weakly defended honey. The honey liquidates and yeast kicks in. A foamy, stinky, writhing mass begins to ooze out from wherever it can. It smells like a college party that has gone really bad. The fermentation smell is VERY strong, drawing in additional ants and flies.
If this happens, the money the homeowner may have saved from a trapout versus a cutout and it's repairs goes out the window and will multiply depending on where the fermenting honey goes. It doesn't happen all the time though. A tree that I did a trap out in early August a few years ago had it happen. Fortunately I had warned the homeowner and he didn't care. I believe the story would have been very different if it was in his house.
For this reason I am very leery to do home trap outs anymore. I've got one going in a tree right now that I started about 6 weeks ago. It's doing very well with its new laying queen. I noticed the beginnings of the beer smell 2 days ago. Time will tell what's going on in there.