The Irish seem to share this theory. When I traveled to Ireland in October of 2011, I tried to drink as many Irish beers as possible (not all at one time), and I discovered that each beer was served in a uniquely shaped glass. I’m sure you’ve seen the same for other beers (Stella Artois comes to mine).
But I think this extends well beyond beer (and, obviously, wine). And this is where it varies from person to person. I prefer specific cups for the liquids I drink every day:
I’m sure everyone has very different tastes when it comes to cups. Have you noticed that you use the same cup for specific liquids? What are your preferences?