What the hell is a "Sports Car"?

I remember having a conversation with a friend about the definition of a "Sports Car".  Some of the automotive press also ponders that same question.  So, we tried to agree on a list of things that make a "true" sports car and we hit a wall.  Here's my list of "must-haves" for a "true" sports car:

1.  Traditional manual transmission (with a clutch you operate with your foot and a shifter you shift with your hand)
2.  Rear wheel drive [puts on flame suit]
3.  2-door car (or 3-door, if you want to talk liftbacks/fastbacks/notchbacks/hatchbacks)

That's all.  It can be a simple Nissan 240SX or the ultra exotic Mercedes Benz SLS.  My friend stated that cars like the Mitsubishi Lancer Evolution should be added, but I argued that the Evo is a "performance vehicle", much like a Ford F-150 Lightning.  He said I'm insane and made a video of my insanity. 

So, what's your list of prerequisites for a "true" sports car? Here's some of my favorites: