John Simm stars in one of BBC1's most keenly anticipated dramas for ages, Life on Mars, in which he plays a detective who is mysteriously transported back to 1973.
Producers have cleverly breathed new life into a seriously old genre - '70s cops driving around in bashed up Ford Cortinas - by giving it a Doctor Who-style twist. It's the Sweeney, Regan, but not as we know it.
Which got us thinking. What two genres, programmes, formats - anything you like, in fact - would you combine to come up with a brand new TV hit?
Here's a starter - cross Celebrity Big Brother with Animal Hospital and watch vets do unspeakable things to D-list former soap stars whose names you can't quite remember (and probably never knew in the first place). No, really, Channel Five, you can have that one for free. Just make sure you give us a mention at the Baftas.
The critics were unanimous in their praise of last night's episode, but what did you make of it? And, like Organ Grinder, have you been listening to lots of David Bowie on your iPod this morning?
