Big Bang Theory, "The Large Hadron Collision"

In this Very Special Episode, The Big Bang Gang™ is celebrating Howard’s court victory by riding in the four sidecars of Cousin Leroy’s motorcycle when suddenly Sheldon’s breaks loose and careens down the hill. Hilarity ensues as he swerves to avoid various obstacles until a semi truck BAZINGAs into him. Leonard struggles to tell Amy—who was not, in fact, killed by Howard—that her ex-boyfriend was in a motorcycle accident and is now in a coma. Amy imagines what life would be like without Sheldon while waiting at his bedside in the hospital.