There is a reason that Friends Season 1 Ep1 remains the most re-watched pilot of the 1990s. It is not the funniest episode of the series (that honor might go to "The One with the Embryos" or "The One with the Routine"). It is not the most dramatic. But it is the most honest .
: Monica’s brother, Ross, is reeling from his divorce after discovering his ex-wife is a lesbian. Meeting Rachel again reignites a long-standing high school crush. Monica's Date Friends Season 1 Ep1
Why? Because of the coffee cup scene.