Friends (1994)

S6E16 The One with Unagi

In a quest for quick cash, Joey signs up for a medical trial, but there's a catch: it's designed for identical twins. Meanwhile, Rachel and Phoebe enroll in self-defense classes, only to have Ross intervene with his own version of "Unagi" to teach them about awareness. On a different note, Chandler and Monica decide to exchange handmade gifts for Valentine's Day, leading them to put their creativity to the test.