This is an IDEA for a game mode which I have named Alien Abduction Survival. I got the inspiration from reading about the UFO Abduction Frenzy mod, which you may find here: http://www.facepunch.com/showthread.php?t=785534
The game mode is like so:
There are two teams, the Humans and the Alien.
The Humans start in random positions around a map (a good map being gm_bigcity) and are given a 15 second head-start to find a good hiding place. The Alien then spawns in a UFO and flies around the map in search of Humans to abduct.
There would be a time limit, say 5 minutes. If all the Humans are found and abducted, they loose. If the Alien abducts all the humans, the Alien wins.
The game mode is basically hide and seek with a twist to it.
If anyone wants to create it, you are more than welcome to do so. Call it whatever you would like, it would be your mod, but Alien Abduction Survival is an idea.