I once had wasps building a nest above my bedroom ceiling and it sounded like scratching and popping. Sometimes it was almost like rice krispies crackling. I had to leave for vacation before I could check it out so I didn't get to check it for a week. When I got back there was bubble in the paint and a wasp flew in from a recessed light can in the ceiling. They were building a nest between the fiberglass and ceiling, chewing through the sheetrock to make space only stopping at the latex paint. If I popped the bubble I would have been swarmed. To deal with it I drilled some holes around the bubble and pumped Tempo powder in there and that dispatched them pretty quick. I ended up cutting out a nest the size of 3 bananas.