"Clownglo" appeared mostly on early ought instruments (e.g. 2003). They tend to look worse in photos than in real life. I've heard it said that some digital cameras have a tough time reproducing reds and can't accurately capture subtleties in the red spectrum - like it thinks that something is totally red or it's not; no shades of red. Certainly "clownglo" happened, but mercifully is a thing of the past.