It is my personal belief, that the active ingredient in the "stickiness" of the cup holder is in fact.........Redbull. I came to this conclusion when I was on my way home from NY yesterday, and I was enjoying an ice cold Redbull. The Redbull was in my cup holder and I realized that even minimal pressure applied to the brake would cause the Redbull can to tip, thus small amounts of Redbull would make their way from the can, and into the depths of the cup securing device.
When I went out to my car this morning, which I might add was baking in the hot morning sun, said Redbull can was indeed stuck to the cupholder, requiring a moderate amount of force to break it free. When the can did break free, I observed a yellow "glue" like substance in the bottom of the cup holder.
So in conclusion.........
Redbull + Heat = Glue like substance