this question only applies to the uk.
the strangest thing ive was an octopus while fishing off barry last november i would guess it weighed about 2lb.
im sure you can come up with something better than that.
Caught a seagull once. I cast out me half a mackerel and as soon as my bait hit the water, the b*gg*r swooped down and flew off with it. Gave me one hell of a scrap. Like flying a flipping great kite. It took me about 5 minutes to "land" it. Felt a right pillock because I had to get a spectator to help me release it.
I caught a trawler from the end of the pier. Never managed to land it though, drop net wasnt big enough!! I caught a fishing rod, its a shame it was just a cheap rubish one. My mate caught a stone too and he also claimed it was fighting.
I caught a boot once, while boat fishing off Penarth. Its something always shown in fishing cartoons but they are hardly ever really caught. I was in a competition so I tried to weigh it in as a "Sole" and "eel" but the weigh in official had no sence of humour
I caught a speedboat on a handline once when I was a kid in Sydney. This flash idiot in a speedboat came roaring in too close to the pier we were fishing off and caught my line in its prop. There must heve been a good hundred yards of line wrapped around his propellor by the time it jammed tight and the motor seized up and leaving him completely stranded out in the bay. God he looked stupid. Everyone on the pier was laughing at him. What made it even funnier is he had his missus in the boat and she was screaming at him for being such a plonker for the next couple of hours while he tried to untangle the unholy mess. I don't know what happened after that. It was getting late so we all packed up and went home and left them to it.
I caught the dingy out of penarth yacht club, the idiot driving seen about 4 of us were fishing by the groins he drove ten yards off shore right in front of us i was the unlucky one to hook up holding on to my brand new rod for dear life as it riped line off my reel had to cut my line before it the rod was pulled out of my hand. To top it off the cheek b....r sent a kid down with my 250yrds of birdied line.
I also caught a MOTER PIKE over the foreshore it was,nt wheely that big thow landed it but it still cost me a rig