It’s one of those jokes that when you see it you go, “How has no one thought of that until now?”
This “Link to the Future” design definitely looks like it’s from a t-shirt, but through endless amounts of image searching, I cannot seem to locate it. But it’s probably one of those Threadless “you must buy this in the next 45 minutes or we’ll burn the design” deals anyway.
I have to say, a badass sports car is a far cooler time traveling device than a fruity flute. Just kidding, I love Ocarina tunes. I’ve had Epona’s Song stuck in my head for years.