Had two similar instances happen to me recently.
I was bank fishing a little cove where I noticed bass feeding on shiners. The cove was separated from an adjoining pond by a small land bridge. As I was tying on another lure with my back to the water I heard drag being taken. So I turned around and another guy decided to drop in not 10 feet away from me. The sound of his drag was due to him being hung up in a tree, so I got a bit of redemption in that instance.
The next day at a different pond, another guy dropped in nearby, and then walked over to me to show me fish he had caught out of the pond recently. As someone who prefers personal space, I told him I was heading off. He stood in he exact same spot I was previously in and caught something first cast. So I walked over to watch him land the fish, which turned out to be a (pregnant)catfish. He asked if I wanted it, I said no, then we just looked at the fish. So taking the silence as a hint, I dug my pliers out and removed the hook and tossed her back in for him.