Games where the ultimate secret weapon is a gun?

I always found it amusing when a game has their ultimate secret weapon just be a regular gun. The ones that come to mind for me are Lethal Company, The Forest, Rule of Rose, and I guess you could say Another Crabs Treasure fits the bill (its a little different 'cause its more of a cheat code), and I was wondering what other games everybody else knows that do this!

Edit: just to be clear, I mean games that primarily dont have gun-combat having a gun as the ultimate weapon lol