In reply to Emilio Bachini:
I'm surprised this one hasn't been mentioned yet:
A Little Peculiar (E6 7b)
"The direct over the imposing roof features the hardest mantelshelf in the world - a free hanging one-armed flip, with no footholds! Good holds lead to the lip but above there is precious little with which to make progress. If you manage the desperate gymnastics, casually saunter up Elegy to finish."