I think the random noises/taps in my apartment may really be Morse code from some type of trapped or enslaved person? Reddit, what other tiny things such as house noises do you imagine being something much greater?

I moved into a new apartment a couple of months ago, and I've noticed a tap (pause) tap tap (pause) tap (short pause) tap. I figured I might as well ask Reddit in the event it's a slave ring. Reddit, what other tiny things such as house noises do you ponder about being something much greater?