well its not quite a goblet...but its a poor man's bong:
take a glass, put it in the freezer for a few hours.
next time you smoke, take your frozen glass and blow the smoke into the glass very slowly. dont inhale the smoke before you blow it in, you want all the THC. you can do this using a shotgun method.
anyway, because the glass is frozen, as soon as the smoke hits the cold air it will sink to the bottom of the cup.
when you've gathered enough smoke, INHALE as if you were drinking the smoke.