Dara's bone fragment
Here's a description of the contestant's attempt. Someone's probably working on collecting some images to illustrate it.
Dara brings in a medical sample tube containing a small fragment of the bone from his knee, which broke off during a football match. He had to have it removed in an operation, but the doctors apparently let him keep it. Greg awards Dara first place for bringing part of his own body in.
(Written by Karl Craven)