I'm sure we all have plenty.
I used to live by a small pond when I was a young teenager and kept seeing this enormous bass (for the area). The pond was probably 40 yards across and was a gravel pit that filled up. It had some stunted smallmouth and bullheads in it. Well one day while fishing with a worm I caught that big largemouth bass, almost ruined my reel. My dad was surprised because he thought the water was exaggerating how big it was haha. Can't remember the measurements but he was a little too big for a 5 gallon bucket which in the north is pretty decent.
I used to live by another small man-made lake and saw another absolutely enormous largemouth bass. Never caught it, should have tried harder.
Of course, even medium largemouth bass are fun. I like when you cast a buzzbait in shallow water and see the mound of water rushing at the lure, knowing you're about to get a hard hit, or rolling a frog over some slime never knowing when a big bass will bite it.
Edit: 5 upvotes and no stories? COME ON chop chop tell me your stories I want to hear about these monsters and good/bad luck etc.