Rachel comments: "Oh god, I hate my job, I hate it I hate it - oh, I want to quit - but then I think I should stick it out - then I think . . . why should such a person stay in such a demeaning job just because it is remotely related to the field they're interested in?"Monica's acute awareness that talent, training and experience are currently utilized doing [insert inane gruntwork] is a genius moment, while the costume highlights her plight beautifully. At some point or another, most working pianists have been there (gruntwork = $$ = good). In situations like these, the best way to keep a good attitude is to find some way of amusing oneself. I like thinking of dumb TV sitcoms, for example.
This earns a sharp look from Monica, currently wearing huge false boobs and a blond wig (as required for her present job), who replies, "Gee, I don't know Rach. Order up! I got a Yentyl Soup, a James Beans and a Howdy, hold the Doody."
Their conversation earns a giggle from an eavesdropping customer who sympathized, "I've been there - I had to sort manikin heads at Manikins Plus" . . . (the scene continues).
*Incidentally, this was in the same episode which shows Chandler feeding jello shots to his dog statue. This has nothing to do with anything. I just find it endearing.