The Strogg Hog from Enemy Territory: Quake Wars. Probably the second most fun vehicle in the history of gaming (with the first being the Warthog from Halo) because of its shield boost which allows you to travel at insane speeds and literally drive right through other vehicles.
About this creation
Here is the Hog without the shield boost.
The awkward way I made the pilot fit in.
The not quite as awkward way I made the gunner fit in.