Around 1960 - I remember our headmaster (who lived in the school house ) came onto the playground at the end of break. " How is your slide boys" he said. "There is a bare bit in the middle" we said, "could you tip a bucket of water on it tonight and it should be great tomorrow" He did and it was.
Don`t think that would happen today
We had one at our juniors, evil bend at the end where kids jumped off into a snowdrift..... I went round the corner and head-butted the railings!
These days I would have made a mint!!
Still got the scar..... 18 stitches... makes me look like Action Man.