Based off of the picture that Game posted to his Instagram and Twitter accounts, it would appear as though he did swipe one of 50's Street King energy drink trucks.  The reasoning behind it is a curious one though, something reminiscent of a Robin Hood tale, as Game apparently jacked the van in order to give the energy drinks out to the homeless.  

He tweeted that when the driver saw him hop in the SK van he turned and ran away with haste, while Game said that he was "headed to skidrow (in Los Angeles) to give this nasty sh*t to the homeless #JesusPiece."  

Who knows how or even if 50 will react to this in a way to get even with Game.  50 is a busy man and doesn't really respond to people trying to disrespect him anymore.

Source: allhiphop.com