I'll never stop being amazed by organists who survived such situation twice in the same recital. After one such piece why can't they check if ALL of their pieces are in the correct order?
"I think I can get through this page alright without looking. I'm sure after that every sheet will be in order. Never mind, here comes a page from the middle of the fugue. Only the faint-hearted double-check everything before the performance. Not to worry, lighting doesn't strike twice at the same spot. Actually it does. Oops."