I found this topic kinda fun, and instead of digging up the old one, I'll make a new one. Dear little sims, please make sure that you're actually home when you invite my sim over, especially when ...
Don't hog the televisions, computers, and stereos every single time I load the darn household.
And teenage sims, stop doing those annoying idle animations whenever I queue up the actions and whenever I command you to pose. Seriously, stop it or I'll age you up too soon.
As for wedding guests, sit the heck down and don't photobomb the screenshots.
And most importantly, for the non-household sims, stop trying to interrupt my sim couple during a date.