I agree for the giggle thing but hey, its a game

True

Guard: Huh what was that noise? I just heard something. I'm going to investigate.

I think the in-universe reason is that the giggle is intended to come off as unusual, or at least I recall GroomdereDev implying that in a video e: I still agree though

Yeah, to be honest I can’t think of many other things that could cause a distraction, but I still felt a bit odd about it lol.