KEL ASK 020 is a comic and an ask answer published in 2015 on tumblr by Kelly Green.
ANONYMOUS: “Uh, Phineas? Were you some kind of snake oil salesman? The bag and the hat kind of make you look like one.”
After gently teasing the anonymous fan for making such unusual assumptions based on two unremarkable articles of clothing, Phineas shamefully admits that said assumptions were nonetheless correct.
“Everyone's gotta make a living somehow right?”