the elevator at legally blonde has the habit of failing at the most inopportune times.
Two I've heard about were;
the Delta Nu's were unable to enter for "bend and snap" so they delivered their lines from beneath the stage. Orfeh changed her line to "I hear dead people". then they stopped the show, and restarted the scene with the lift working.
More recently (and covered heavily in another thread) was Christian and the Elle's Door set piece for the title song. Laura Bell Bundy covered with a cut verse.
"Grease," the fourth revival of the season, is the worst show in the history of theater and represents an unparalleled assault on Western civilization and its values. - Michael Reidel