Even though the "clashing" yellow with all the purple, is small in this photo, I think it still really pops out of this picture. I guess that is why they call it clashing!
Exif:
Camera: Nikon D40
Exposure: 0.013 sec (1/80)
Aperture: f/5.3
Focal Length: 160 mm
ISO Speed: 200
Exposure Bias: 0 EV