Someones let loose with a baby crocodile that grew too big for the tank and chucked it in the lake and now years later after feeding on fish, birds that land ...........
I watched a film in my younger years that scared the living daylights out of me that a baby alligator was flushed down the loo and it lived in the sewers and then there was an accident at a chemical works and this stuff got washed down the sewers and the alligator drank some of it and it grew and grew and grew . then turned into man eating alligator........ the film ended with someone flushing another croc/alligator down the loo.........
I got an over active imagination shoot me!!!