Popplers, Popplers, get your Popplers here!
I'll second that--though it was tough deciding between "The Problem With Popplers" and "I, Roommate." It ultimately came down to the fact that I have
always loved the former, which strikes me as an unquestionable classic, while the latter took years to really grow on me.
Like, "I, Roommate" is a pretty quotable episode (I find myself using "I hate the people who love me and they hate me" quite often), and it establishes a bunch of important recurring plot and character points (
All My Circuits, Bender getting "drunk" in the
absence of alcohol, Fry and Bender's living arrangement)...but it also makes generous use of Jerkass Fry, which is my least favorite iteration of Fry.
Not that his behavior is all that stellar in TPWP, but at least when Leela calls him out for sucking down Popplers like the fat hog he is, he more or less concedes the point.