Dos cervezas, por favor
Well, that's two beers, but you can have one too.

So what's the rude way?
( K2k6 has a proper job these days, Tue 5 Oct 2010, 8:44, 1 reply, 15 years ago)

Well, not rude
But we don't say pleas and thank you as you do. That's over polite for us, and makes uf feel uncomfortable, as if you thought you were above us. A bit posh, you see?

I'd say: Me pones dos cervecitas? or just Dos cervecitas (using the diminutives makes things sound nicer)
(Aberracion Life's getting very complicated, but a lot of fun., Tue 5 Oct 2010, 8:45, Reply)

Thanks. I'll remember that next time I'm in Spain.
In countries where I don't know the local language for beer* I have been known to point and hold up the relevant number of fingers.

*Hungary was one, but I did learn it after a while, only to have forgotten it again.
( K2k6 has a proper job these days, Tue 5 Oct 2010, 8:49, Reply)

That's known as international language
Nothing of that nonsense of Esperanto, when you can use your hands.
(Aberracion Life's getting very complicated, but a lot of fun., Tue 5 Oct 2010, 8:55, Reply)