When I was doing my A levels our form room was the biology lab.
There was an empty fish tank on one side of the room, so one afternoon a load of us went to buy goldfish. All the girls gave theirs stupid names like Twinklefin and such, and I called mine Barry, which they didn't like for some reason.
We hadn't really thought through how we were going to look after them during school holidays, so we came back after the first half term of the year to discover that Barry had cannibalised his tankmates. The girls screamed, some cried, I laughed my arse off.
( BraynDedd Natasha Kaplinsky's labia majora, Mon 4 Feb 2013, 14:53, 1 reply)

I knew of a pet shop that had a piranha called Adolf when I was a youngster. It had its tank to itself as well.
(Finster Ate a cat biscuit for a bet, Tue 5 Feb 2013, 22:13, closed)