Piranha found in the River Thames.
Yikes!
I remember some movie I watched as a kid where there were piranha in a river (probably in Africa or something) and they threw someone/something in it and the water just BOILED with blood. It was disgusting!!! I also had a friend who had one of these things in HS in a tank in his room....I never could understand the appeal of having a pet that could chomp off your fingers.
No swimming in the Thames for me!