What's your favorite trait to give as a personality flaw?

I do have a major tendency to give each of my sims some sort of flaws, whether via traits, gameplay or other means (like a spellcaster curse I refuse to get rid of), but I can't really name a favorite. I just kinda pick whatever I find fitting or interesting for the character, nor do I like to repeat certain ones too many times and instead explore other combinations. Though it does seem like my evil and mean ones kinda manage to grab my attention a lot. Perhaps with these characters it's the combination of traits and roleplay but I just find them funny... although they can occasionally get frustrating too because of my mods which make them really aggressive. Kinda became a must to also get a mod which tones down their shenanigans once they actually like a sim enough. Otherwise (unless they have some other traits or rep or such to balance it out) they'd just manage to sabotage all their relationships lol.