Even for a game known for some really bent comic themes and recurring gags, this concept is way the hell out there, but Portal 2 was originally going to see Chell, the protagonist, get married to a turret.
Erik Wolpaw, one of the writers, revealed the idea at a panel at PAX yesterday. Wolpaw said Chell was going to encounter a lost tribe of abandoned turrets. She would then help them out, and ultimately the huge Animal Turret King (seen in that video above) would officiate a ceremony in which Chell was married to a turret. Wolpaw said that a “bride turret” was even constructed for the scenario, Game Informer reported, which would then follow you (as Chell) around after the ceremony.
Chell Almost Married A Turret In Portal 2 [Game Informer]