Oh, that trait.
I love unexpected sim behavior generally, but ever try to get an inactive (not player controlled) sim to concentrate on something such as playing in the band they supposedly belong to when they keep walking away from it to flirt and give flowers to everyone else on the lot? To be fair, most of the flower recipients looked really happy as if their day had been made. I finally decided it would be more kind to kick him out of the band so he could keep doing things like that and selected a random replacement from those crowded around rather than keep trying to control that behavior.
The sim I selected randomly had apparently never even held a guitar before, that seemed to make his day as well -- a yellow 1970s style smiley face lit up as did his own happy face, the game went "Ding!" etc. He later became very good at it and a valued family friend, so all was well that ended well. :)