A good example of "stupid but harmless things teenagers do when they're bored": (No, this doesn't happen every day.)

This is already a few minutes in:

Do you want me to come back out again?

Guess not. Hey look, no wonder the pool's closed! (hint: there's maybe two feet of water in the deep end)

This was my idea, actually...

Relaxing after climbing back out:

It's strange how a lot of things just scream out "climb me!" Strange fetish. Certain persons were restraining me from trees.