"What good is your bucket doing you now?" Jackson jeered.
"I'm glad you asked!" Kate said, bending over the brook to scoop the bucket full of water. Instantly it was as heavy as a bowling ball. Returning to look down into Jackson's icy blue eyes-- he was only a few rungs from the top-- she gave him a friendly wink.
And dropped the bucket.
*etc etc etc he falls, the other evil guys fall*
"Instant ton of bricks," Kate said with satisfaction. "Just add water."
Trenton Lee Stewart, YOU ARE A GENIUS!!!!! XD
I quoted from his book, "The Mysterious Benedict Society"