I used to have a snail. Then I had two. Then I stuck them in the
pond in the hope they'd reproduce (yes I know I only needed one, good
thing two, I accidently crushed one) and eat some of the algae.

Unfortunately it didn't happen the way I wanted. I went on holiday and
came back to find the kids from next door had popped in. They pulled
out all the frogs, took all the rocks out (all the eggs dried in the
heat and died) threw in all the grass from the compost heap and
emptied the BBQ into the pond for good measure.

The parents didn't disipline the child, and she tried some similar.
Fortunately I saw her and her friend sneaking in (I was filtering my
tank from upstairs and "accidently" syphoned the waste water upon
their unsupecting heads.

Well, they weren't meant to be in my garden, I could hardly expect
trespassers could I? lol