I found about the clumsy trait in TS4 mentioning that clumsy sims will need more time to get promoted in the astronaut or athletic careers. I tested this statement ingame with otherwise identical sims, one had the family-oriented trait instead. I have not seen this anywhere else online, surprisingly. Did you know that? Because clumsy is always labelled as a trait with little effect on gameplay.
Let children ride bikes! Let sims have actual one-sided relationships!