There are a few that spring to mind.
A Seal on a side drain off the Witham that seemed intent on chasing a Spinnerbait repeatedly, drove me off the water.
A Kingfisher, that landed on my rod tip whilst I was lure fishing on the River Trent. It didn't perch there for long, perhaps a couple of seconds. But I was holding the rod at the time, that made it special.
Then there was the ''dopey'' Pike at Dam Flask. This took place in the area known as the bay. At the time the water was low, and much of the steep rocky bank was exposed. Just as I was about to make a cast, a couple of bait fish came flying out of the water a few yards in front of where I stood, followed by a huge swirl, then a crack as the pike hit the submerged rocks at my feet. We were gobsmacked, the pike ''and a good one'', lay at our feet lifeless. My mate Ches netted the fish, and spent the next half hour trying to revive it in the landing net, sadly to no avail. So after quickly weighing the fish, we buried it close by after removing a scale for a growth check. How big you ask, well I did say ''a good 'un'', the poor sod went twenty eight and a quarter.