Well the where is only part of the equation, as Sir Bustalot pointed out the Vatican is Tall and has a Lightning Rod. The more important thing is the timing. Payback was implying that the lightning was sending a message from God to the Pope via said lightning telling him its time to resign. But these exact pictures were taken after he had already resigned which I Googled when this was first posted. And I disregard a lot of facts when discussing Religion, its not like facts have anything against faith and unwavering conviction that your book wasn't written by L Ron Hubbard Sr.