I thought that was a riff on the famous riddle of the man hanging dead from the ceiling above a puddle of water in a room with no furniture and locked from the inside, which I always thought came from Sherlock Holmes, but google won't confirm this so I must be wrong.
It would be screamingly famous if it were canon. The hanging clown/man, puddle of water, riddle - only involves a block of melted ice, not dry ice under the bed. Curious where the dry ice one originated.
Could be an urban legend: http://message.snopes.com/showthread.php?t=45199
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Date: 2013-02-08 04:15 am (UTC)No, it was "The Crooked Man."
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Date: 2013-02-08 01:58 pm (UTC)no subject
Date: 2013-02-08 02:19 pm (UTC)no subject
Date: 2013-02-08 02:42 pm (UTC)no subject
Date: 2013-02-08 04:12 pm (UTC)no subject
Date: 2013-02-08 04:40 pm (UTC)Could be an urban legend: http://message.snopes.com/showthread.php?t=45199