I'm still not caught up on detective conan that series will be the death of me, but

....idk his happiest moments tend to get ruined

usually by shrinking

(for Shinichi that is)

YEAH I'M... NOT EVEN SURE WHAT TO PICK long canon is long and 'happiest' moments are hard

For Polka, that... is also a hard one

all of her happy moments tend to be bittersweet in some way as well

though I suppose when she's revived(???) at the end and everything is saved and she gets to mack on allegretto would probably count