What It's Really About:
In a Rolling Stone interview, Vedder explained that "Alive" was meant to tell the origin story of a molested serial killer. In the song, a mother notices that her son has started to resemble his father, who died some time ago. Feeling lonely and wanting to reconnect with her past lover, the mom goes all The Graduate meets Boardwalk Empire on her kid, and they end up having some nice mother-son naked time. Thus the lines:
Oh, she walks slowly, across a young man's room
She said I'm ready ... for you
I can't remember anything to this very day
'Cept the look, the look ...
"Mrs. ... mom, you're trying to seduce me."