I'm surprised that Mani, of all people, shouldn't appreciate the
formal process  which allows one to compose a barman, a tap,
and a pint glass with a reasonable expectation that one's thirst
shall be satisfied.
Note that the process of pulling a pint of Guinness is similar
to that for pulling a pint of Beamish, but a shamrock is used
instead of a "B". Although one might be expected to find the
brewer's name on the glass (or, up until recently, be able to
infer it from the establishment ), it seems that even the
relatively low-tech world of stout recognizes the advantages
of self-describing content...
 "What's your pleasure?", The Economist, 21-Dec-96