extras in the movie of life

Upon exiting the Government Center T station through the turnstiles, I hear it:

"Animal rights. Sign the petition."

The shout is monotonous. The speaker's face, expressionless. If she were a stand-up comedian, I would call it deadpan. But I think she's serious. I think she really wants people to sign the petition. With a complete lack of passion or enthusiasm, though. It's like she's been put up to it.

Rather, it's like my life is a movie with bad extras. Where do they find these people?