はしゃ
hashagu

Godan Verb (gu)

1. to make merry; to frolic; to be in high spirits

Intransitive
Usually Written in Kana
そんな些細 ささいなことで、鬼 おに くび ったようにはしゃがなくてもいいじゃない。
sonna sasaina kotode onino kubio totta yōni hashaganakutemo iijanai.
There's no sense acting all triumphant like a conquering hero over such a minor thing.