What does Gmail think of you?

So I had a conversation with some girlfriends this weekend and one of them had an interesting revelation. Apparently Gmail scans your emails and picks up on keywords, then they choose the ads they place on your gmail page accordingly. One friend who was recently married said she was seeing a lot of photographer ads and vacation packages. I personally have never looked at the ads beside my emails but became intrigued and went back to look at them.

Here's what gmail thinks I'd be interested in:

Germany's News in English - breaking news, views and chats from Germany.
Hmm... never been to Germany, never thought about Gemany, don't know any Germans. Apparently gmail thinks I need to get out more. travel the world. Thanks for the tip, gmail.

$250,000 Income Potential - Entrepeneurs wanted. No selling. Turnkey system.
Apparently gmail thinks Ijust fell off a turnip truck and am scam-able. Bite me gmail.

Toxic Tort Lawyers - Helping Chemical Exposure Victims.
Really? What? Do you know something I don't gmail??? Should I make Dr's appointment?!

I don't know what words they are grabbing from my emails, but it's not the right ones. I should be getting ads for debt consolidation, immigration laywers and dating websites. Gmail, you don't know me at all.