True story - my high school colors were purple and white. We had a team manager for the football team who was overweight, and unfortunately, not very attractive. Every game day she wore this even more unfortunate purple sweater/sweatshirt thing. The end result was that the combo of her being overweight, wearing the sad purple shirt, and her unfortunate facial features created a scarily accurate facsimile of the McDonald's character Grimace.
The moral of the story is, purple makes you look stupid and, in the wrong circumstances, like a character in a plot to make children addicted to fast food.