Looney Toons

So, so far in India, I've learned never to call a restroom a restroom or a bathroom for that matter. Call it a water closet or toilet and you'll find what you're looking for. Saturday night after going to Peter Cats, we went to Barista (read: "Indian Starbucks") and had a brownie and drinks... I asked for the Water Closet, and got blank stares... Restroom? Blanker stares. Bathroom? Toilet? Urinal? Oh! upstairs to the left. It's good I have vocabulary... else I don't know how I'd be able to evacuate my system. (Of course in India there is always the curb.) So apparently they label the Water closet as a loo in Barista... if you call it a Loo, shouldn't you also know water closet? They're both British. And Loo is slang, right?