Have you seen this thought bubble?

I always turn thought bubbles off so most of them are a mystery to me :D Having said that, perhaps more information on what was going on at the time might help. For example: What trait does the sim have? Did you instigate the conversation and know what kind of talk it was? Because I leave my sims mostly to autonomy and have thought bubbles turned off, I have to hover cursor over thumbnail to see what kind of interaction my sim is engaged in.