Ric said:

>Anywho, the short of it is there is a small nitrogen bladder in the
>can which releases its stuff when the can is opened...<snip>

IMHO Boddingtons is better(same sort of can), but printed on the can is
the phrase "Do not tamper even when empty" or something similar. I guess the
bladder is filled with radioactive nitrogen, kind of like the inside of the
radioactive bouncy stuff inside of a golf ball, eh? :-)

Cheers,

David