A crazy deal has instructive points

Henny Youngman said, "How to drive a guy crazy: Send him a telegram and on the top put 'page 2'."

How to drive an opening leader crazy: Give him a wild auction like this one. What should West lead against seven spades undoubled? Would West's choice of card change if East had doubled the final contract?

South opened four no-trump, hoping partner had the heart ace, so that he could play in seven no-trump. But when North denied that card, South confidently leapt to seven spades.