Do It The Caltech Way. Dump Water On The Victim's Bed Until It's Soaked, And Pour Liquid Nitrogen On The Bed Until The Water Freezes.

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Do it the Caltech way. Dump water on the victim's bed until it's soaked, and
pour liquid nitrogen on the bed until the water freezes. You're right that
it's heavy -- so heavy that the victim must wait for it to melt before he
can get rid of it.

PS - It destroys the mattress covering, so be prepared to replace the mattress.

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