I've watched Acid Kat spontaneously orgasm while on this combo... it's definitely some whacky shit. There's reason to believe that mixing any type of CNS stimulant with Ketamine enhances the neurotoxicity of ketamine.
some call it Calvin Klien. Use in moderation and you should be fine.
I've never tried this myself, but I've heard from many people that it's a particularily nice combo. If I had coke more often (or liked it more), I would definitely give it a try.
My friend calls 1 part coke to 4 parts K party mix. It's enough coke to keep you from falling into a k hole, and enough K to fuck you up. More coke seems to level out the effects of the K