Earlier today in Fallout 4, I was trying to make some progress in the main quest, but ended up just dicking around post-nuclear Boston to see if I could find anything interesting, as I am wont to do. I had reason to believe that I would be up against some pretty tough enemies, so I had taken Paladin Danse with me as my companion for some extra firepower (and also as a bullet/laser sponge to hide behind in the event that the shit really hit the fan). For the uninitiated, Brotherhood of Steel paladins are power armour-wearing elite soldiers, like so, and I figured he would be the best guy to take into an intense battle against the worst that the Commonwealth could throw at me.
At the moment, though, I had gotten distracted by a building off to the side of the road, and sauntered over to see whether there was any good loot to be found. When I got near, a few angry bloatflies buzzed out at me. They're basically big mutated flies, gross-looking but not much of a threat at all. I drew my pistol, knowing I could kill them easily with one bullet each, but before I could fire a shot, I heard Danse yell "Bloatflies! Take 'em out!" from next to me (I had no idea he had specific dialog for bloatflies until then, but it was kinda neat).
Instead of using his usual laser rifle, though, I saw him whip out a freaking minigun and proceed to annihilate the bloatflies in a hail of dozens of bullets. I was very confused, wondering where the heck he had gotten this gigantic gun from, but then I remembered that during the last quest I had done with him, I had looted it off of a super mutant to use for scrap later, and had given him some ammo for it in case we came across any more enemies. I hadn't actually told him to equip it, but I guess he decided that relatively weak, squishy insects were the enemies that warranted the kind of firepower that one normally uses to kill a deathclaw.
Whatever, if he wanted to waste it on bloatflies, who was I to judge? I continued on into the ruined building, but Danse decided to go around the side of it for some reason. A few seconds later, I heard him yelling again, along with the sounds of another fly attack. Figuring he had it under control, I kept moving, but was interrupted by an enormous, ground-shaking BOOM, and the sky lit up with fire.
I rushed outside as Danse proclaimed "That's how we do it in the Brotherhood!", wondering what the fuck could possibly have happened this time, and there he was, posing majestically with the minigun in front of the still-flaming wreckage of the car that had just exploded as a result of the spray of bullets. It would have made a perfect promotional image for the Brotherhood, if not for the two small bloatfly corpses on the ground.
I had gone up against much tougher enemies with him already, but that incident remains his biggest display of badassery. Never mind synths or super mutants, TIL the Brotherhood of Steel considers bloatflies the real threat to all of humanity.