How is that possible? It's just so bizarre. Maybe I picked it up from somewhere, or someone said it online - but I don't remember that. I remember thinking how funny it would be to say a colour tasted like something. And then to further proclaim that this something was good. Just because. Ohh, ohhh, research shows me that one reason why it might be "tasting purple" is a reference to "Roswell That Ends Well" when the red and blue combine (Fry asks "does something smell blue?") so that lends even more credence to me coming up with this independantly. I have the same creative insanity as the Futurama writers one assumes. It's... odd.
And just for you -
Got the desktop pic from tfp.killbots.com