Punk Chick - S1-E22
Corrected entry: This episode was supposed to air before 22 (1x22) "The Water Tower", because in this episode where Eric tries to talk some sense into Hyde about moving to NY he speaks of "we were going to paint a pot-leaf on the water-tower" something they already did in the episode before.
Correction: In "The Water Tower," everyone agrees that their pot leaf looks like a green hand giving the finger, then Kelso has his fall, so they might regard that as a failure and still be planning to do it right next time.
Captain Defenestrator