A Rock can be obtained in the Mogre Camp by picking them up. They are required to enter the Crab Pen which is primarily used during Recipe for Disaster. It is never seen in the inventory as they disappear upon entry. A glitch existed where it was possible to see it in the inventory by using Telekinetic Grab to obtain the rock from the Crab pen, which was later fixed. Dropping the item on land and then picking it back up used the same animation as under water. Now, attempting to use Telekinetic Grab results in the message "The spell doesn't work down here."
A player performs the glitch.
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