I was browsing through the adventure pitch thread and I remembered one of the best sci-fi stories I've ever read.
The Accidental Space Spy, by MSPaint master and biology bizarrist Oyvind Thorsby. It's a webcomic.
Not only does it have a crazy and far-flung – but ultimately gripping – plot, it also showcases some hilarious essays on parallel evolution of alien species.
Whenever you are looking for a hilarious twist or a ridiculous setting (man I loved the Invisible Zone arc) for a sci-fi campaign, I suggest you give it a look.