"Superstition" is the twenty-first episode of the second season of Grey's Anatomy and the 30th produced episode of the series. It is also the 30th produced episode of the Grey's Anatomy franchise. It was broadcast on March 19, 2006.
A series of four deaths on the surgical floor brings out everyone's superstitions as the staff expect three more fatalities. Izzie worries for Denny when he undergoes major surgery and reaches a crossroads in regards to her relationship with Alex when he jealously informs Denny of his chances of death. Cristina taunts Burke when he refuses to kick their new houseguest out of the apartment while Callie grows tired of waiting for George. The arrival of his old sponsor in the hospital forces Richard to reflect on his alcoholism and reassess his relationship with Ellis.
- "My college campus has a magic statue. It's a long-standing tradition for students to rub it's nose for good look. My freshman roomate really believed in the statue's power and insisited on visiting it to rub it's nose before every exam. Studying might have been a better idea, she flunked out sophmore year. But the factis we all have little superstitious things that we do. If it's not believe in magic statues it's avoiding sidewalk cracks or always putting our left shoe on first. Knock on wood. Step on a crack, break you're mothers back. The last thing we want to do is offend the gods."
- "Superstition lies in the space between what we can control and what we can't. Find a penny, pick it up and all day long you'll have good luck. No one wants to pass up a chance for good luck but does saying it thirty-three times really help? Is anyone really listening? And if no one's listening why do we bother doing those strange things at all? We rely on superstitions because we're smart enough so know we don't have all the answers and that life works in mysterious ways. Don't diss the juju, from wherever it comes."
- "You Don't Know Me" - GreensKeepers
- "Catalyst" - Anna Nalick
- "Free" - Luke Doucet
- "How To Save A Life" - The Fray
- "Gabriel And The Vagabond" - Foy Vance
- "Multiply" - Jamie Lidell
This episodes' title references the song Superstition, originally sung by Stevie Wonder