The Strangest, Silliest PC Gaming Crossovers
(N4G PS3)

Whether its an Easter egg, a joke character, or just a little nudge at a competitor, developers love slipping the odd reference to other games into their own. Sometimes though, they go beyond just slapping a Dopefish on a wall or quipping about a doomed space marine, and we get to see our heroes stride into entirely new, often completely inappropriate new worlds. Here are a few favourites, along the ones that caused the most wait, what? blinking on discovery.