Joke, Groucho Marx as Professor Quincy Adams Wagstaff from Horse Feathers (1932)

Baravelli: There's a man outside with a big black moustache.
Professor Wagstaff: Tell him I've got one.

- Groucho Marx as Professor Quincy Adams Wagstaff from Horse Feathers (1932)

AFI #030 Greta Garbo as Grusinskaya from Grand Hotel (1932)

I want to be alone. I think I have never been so tired in my life.

- Greta Garbo as Grusinskaya from Grand Hotel (1932)

The bolded line is ranked #30 in the American Film Institute's list of the top 100 movie quotations in American cinema.