Happy moodlets will boost any other positive emotion, so yes, once you get a single playful moodlet you’re likely to get it boosted by anything else that makes the sim happy (and there’s usually at least a few of those). And yes, hysteria is extreme playfulness. But what I was wondering was what specifically the moodlets were - not just what emotion they trigger. Is it clean laundry, a playful conversation, being near someone they’re jokesters with, active playful decor, etc - because if we know what’s triggering it for you, we might be able to figure out how you can avoid it.