Just saw an episode title (Legacies, https://www.imdb.com/title/tt14178112/?ref_=tt_eps_cu_n) called "Yup, It's a Leprechaun, All Right".
This reminded me of an old game I used to play, where you click on a cow and it says "Yep, it's a cow, all right".
This kind of sentence seems to be used prety often, so I was wondering if it is maybe a reference to some famous quote I don't know that native speakers maybe all know?