We had our first 3-month old in our first apartment in Honolulu. The people upstairs were having a small party and watching SNL, and they were laughing and having a good time. I was totally sleep deprived (3-month old will do that to you) and the noise was drifting into our apartment. As anyone with an infant knows, your decision-making is pretty well fucked after several nights of bad sleep and general exhaustion. So I stormed upstairs, knocked on the door, and really let them have it. I mean I was a real dick about it. They quieted down but honestly they weren't even doing anything wrong in the first place. I went upstairs the next day after getting some decent sleep and apologized. The guy wasn't super excited to see me again, but I didn't blame him. I still feel bad about that, but at least now I have some empathy for new parents and all of the shit they have to deal with.