I was thrown into some sort of strange loop while watching the Pet Shop Boys "Pandemonium" concert.  Neil Tennant was lip-synching a duet with Dusty Springfield.  The dearly departed Springfield appeared in the form of a massive projection.  Not only was she not present (except in spirit), but she was lip-synching, too, as her filmed footage wasn't of a live performance.  There was Neil Tennant, "pausing" his lip-synched stanza to make sonic space for the projection of a deceased woman to lip-synch her own pre-recorded chorus.  I was left . . . well . . . speechless.