A: My tap card isn't working!
B: Why not? Try it again.
A: It's still not accepting the fare.
B: Is the magnetic strip broken?
A: No, I just used it at the station.
B: Did it run out of credit?
A: No, I just refilled it yesterday.
B: Did you tap it upside-down?
A: I tried flipping it several times.
B: Look, you're using a metro card.
A: What's the problem with that?
B: This is the Montebello bus line!