If you're travelling abroad, these are the two phrases you must learn in the language of any country you visit:

Two beers please.


My friend here will pay.

Needless to say, this works best if you're travelling with someone who doesn't speak the language.
Some sample phrases to get you started:
Zwei Biere bitte. Mein Freund hier zahlt.

Dos cervezas, por favor. Mi amigo aquí pagará.

Two beers, Mate. And the drongo sitting next to me will slip you a rock-lobster.