You know you're in Buenos Aires when...

you arrive home at 2AM, and your host says "You're early".  And he's not being sarcastic.

Some of the clubs here don't open until midnight or 1.  New Year's Eve, the parties don't start until midnight, you have dinner with your family and then at midnight go out with your friends.  Someone at the party I was at tonight told me she tried to have a party on New Year's Eve once, but nobody could make it, since no one was available until after midnight.

Anyway, party tonight was nice, 20-25 people, on the terrace of an apartment building.  Again, it was the Groupo de Ingles, and collectively and individually they are very nice to foreigners.