Anything by Philip K. Dick - he's dry, witty, dark, a brilliant sci-fi/fantasy/horror writer and his abbreviated name sounds dirty.
Best sci fi Page 2
As well as some stuff already mentioned, some classic Doctor Who was rather funny. Including this one written by Douglas Adams - https://www.youtube.com/watch?v=7mmal0PMkmI
I'm making a comedy sci-fi puppet series also called Cosmic Pup, hehe - http://www.youtube.com/watch?v=WpM1UgYyM_Y
I think there's a sitcom on in AMerica at the moment called 'Neighbours'. It might not be called that. ABout some people who move into a new community and discover all of their neighbours are aliens. You heard me.