hell, I've just noticed the sucker fish is going round like its on speed!
My dad used to keep a few tanks of tropical fish, but the time came when he was loosing interest and he decided that as fish died he wouldn't replace them, and as kit packed up he'd rationalise it all. In the end he had just the one tank left, with the last bits of working filter, heater etc and the last dozen or so fish.
We had family friends visiting and the fish came up in conversation and my dad explained the 'giving it all up' plan and when they're pop their clogs thats it, all over. It was almost like they knew they were being talked about as they were much more animated than usual, zooming around like mad.
Our friends slept on the bed settee that night, and the next morning they were saying the fish were whizzing around so much it was keeping them awake, but that they'd finally calmed down.
My dad went to have a look and they were all dead. He went to scoop them out and the water was almost boiling. The thermostat had packed up and the fish had, quite excitedly, been poached alive while we all watched