[S]top trying to make a bong out of a damn Pert Plus bottle and pay attention you undergrad noobs, I’m about to drop some grad school economics on you.
Alternate version, via an MIT professor: Girlfriend, car, hobby. Pick one.
I bit the bullet and shared a house with two other grad students for four of the six years I was in school. Rode my bike or walked to school on weekdays when parking permits were required. Tutored for beer money.