Ooh, that does sound fun Blindey, but you know the rules. PG-13 except in cases where 13 is inappropriate and except when 13 isn't inappropriate enough.
Put a shot glass in the bottom of a larger glass. Fill the shot glass with amaretto. Fill the larger glass to the top of the shot glass with orange juice. Top off the larger glass with beer (Shiner Bock is a good one for this). Chug.
It looks and sounds disgusting, but is actually really good. One of my favorites at the Dry Bean.