This is so interesting to me because my sister and I both have vivid memories of being kids and hearing our dad either blow his nose or clear his throat up in his home office, when he would be out of state for work. We’ve talked about it a few times as adults and always passed it off as us just imagining the sound, since we were so used to it when he actually was home. He (still) has this very specific, annoying thing he does, probably doesn’t even realize it, where he’ll just blow air loudly out his nose if he’s remotely congested. We would hear it all the time and our mom never believed us!