Flagstaff

Flagstaff is a city in Arizona.

History
While doing a math test at school, Mrs. Krabappel tells Bart to visualize the math problem, which involved trains. Bart does so, but his visualization quickly turns into a daydream wherein Bart is brought to a train conductor because he didn't have a ticket. Bart pleads with the conductor, saying that he'll buy a ticket and asks him how much the fare is. The conductor turns out to be Martin and he tells Bart that it's "Twice the fare from Tucson to Flagstaff, minus two-thirds of the fare from Albuquerque to El Paso". Martin then laughs maniacally and Bart's daydream ends with him lying on the classroom floor.