Last September my wife and I moved, part of the draw of the house we picked was a retention pond in the back yard. It was kind of pretty, with ducks and geese and best of all, no neighbors! My wife was so happy for me to have a place to fish, but honestly I didn't think it would hold fish. I checked it out, saw a couple of little bluegill and figured ok, maybe I could go catch a couple of stunted gills from time to time.
First month of the house and I never fished it. When I finally did go down to fish it, I did so more to say "Yeah, I have a house where I fish in my backyard" than really catch fish. Then I caught my first fish, a bluegill on a fly rod, and the thing was an absolute slab. I proceeded to catch several more, and also had something huge break me off. Turns out that there are huge bluegills, 10+ pound carp (I'm going to get one soon here), and bass. For example, last night I just walked around the pond, maybe 20 minutes, and got 4 or 5. I never guessed this pond would produce 4-5 fish like this in a 20 minute around: