Is green & gray really a bad color combination?

Asked by kevbo (25680) August 22nd, 2007 from iPhone

a comic on Whose Line is it Anyway? said never wear green & gray during the course of an improv skit, and it has stuck with me for like 10 years but never really goaded me into getting a definitive answer. Now that I'm looking at green & gray through the train window from PDX to SEA, I need to know. Thanks!