Scotty had a joke in an original Star Trek episode about being unable to identify a beverage he was serving an alien in an attempt to get him drunk. Scotty was finally reduced to saying, “It’s… green.” Data had a similar gag in one of the ST:TNG movies.
All I can picture is Nigel Tufnel in This Is Spinal Tap explaining to the director that his bright green skeleton t-shirt is an “exact replica of my innards.”
When it’s mentioned that, of course, it wouldn’t actually be green, Nigel says, “It is green!”