Hey, Puppetmaster. Some of the thought bubbles are pretty cryptic. But, many are self-explanatory. For example, if a hamburger one pops up, then you can be assured that hamburgers are that Sim's favorite food. Same thing with a particular music choice. Lifetime Wishes can pop up in thought bubbles. Traits often pop up. Almost anything can. To be honest I typically don't give them too much attention unless I'm trying to gain a specific piece of information. But, most often the thought bubbles, graphically speaking, are at least in the same ballpark as many of the graphics in CAS and throughout the game.