Mine is one called "Test Pilot" about a pilot who dangerously test planes and the woman who unfortunately loves him. Whats yours?

Nosferatu.

Nosferatu and Night of the Living Dead

Any of the old The Three Stooges short films. I loved them all.

Vampyr
The Seventh Seal
Metropolis
Freaks
12 Angry Men
The Wages of Fear
The Night of the Hunter
Bicycle Thieves
The Third Man
Anything by Charlie Chaplin

Although it's not old, Pi is a great black and white experimental drama. Definitely worth a watch!

King Kong rules. Godard's Band of Outsiders is pretty classic too.

Probably The Great Dictator.

Citizen Kane is supposed to be one of the best films ever made. I thought it was OK, but it didn't live up to the hype :(

Kafka. Well, it's mostly black and white.

...Young Frankenstein? IDK.

Multiple Maniacs

Mark of Zorro.

I was tempted to say 101 Dalmatians :P

For me it would definitely have to be Akira Kurosawa' Shichinin no Samurai. I first saw it when I was 14 and studying Japanese in high school and was blown away. By the end of the class, there were only a few of us still stuck to our seats. The majority of the class weren't interested in watching such a "slow and boring" movie.

Young Frankenstein, unless you mean movies that were in black & white because that was all there was, in which case it would be Chaplin's The Great Dictator.

It's a Wonderful Life