Funny story that had me laughing for 5 minutes. My main Sim, I wanted him to wire the house with speakers (as I like having surround sound throughout the house).
When he finished, everything was good. Until... his wife who was sleeping, came down and proceeded to yell at the stereo. I was like "What the heck? Why are you yelling at the stereo?".
Then I noticed she was awakened by what my Sim did. And I just busted out laughing. That's a great way to end a happy marriage, for dang sure.
Got to remember, there are other Sims living in the house now.
What made is funny, my main Sim is a Loner, so I'm used to him living on his own. So I had him replace what took several ingame hours to Upgrade Speakers instead.