When I was a student
I had heard that two 5p pieces (before the size was reduced) stuck together with superglue would work as a pound coin.

They didn't. The combination was too heavy, apparently. So my mates and I started experimenting by drilling holes in the 2x5p piece.

Unfortunately, we never got it to work, and ruined considerably more than £1 worth of 5p pieces in the process.
( K2k6 has a proper job these days, Thu 4 Nov 2010, 18:13, Reply)