Phoebe and Rachel played cheeky pranks on Monica and Chandler, reaching a daring peak in season 5. In one memorable episode, the gang engaged in psychological warfare.

(24) "Monday: One day. Tuesday: Two day. Wednesday: When? Huh? What day? Thursday: The THIRD day." - Joey

Joey coined a bizarre rhyme to harass Chandler for an audition. It stuck with us for some reason.

(23)"They don't know that we know they know we know.

" - Phoebe

Phoebe revealed her cynicism when her psychic predicted she had one week left to live. Her classic line felt straight out of a cynical comedy.

(22) "It's so exhausting, waiting for death." - Phoebe

Rachel's grand romantic gesture for Ross turned sour when she realized he had fallen for someone else. Her reaction was perfectly encapsulated in this iconic line.

(21)"Isn't that just kick-you-in-the-crotch, spit-on-your-neck fantastic?" - Rachel

(20)"You don't own a TV? What's all your furniture pointed at?" - Joey

Ross donned an armadillo costume to teach his son about Hanukkah, which became one of the show's most memorable moments.

(19) "I'm the holiday armadillo!" - Ross

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