Some years ago the concept of a "fun run" came into being and around here started with a colour run. Five kilometres of running/walking/dancing through splashes of colours being lobbed at you. Start in white clothes, end a technicolour rainbow. All great fun.
I've photographed them from within the race, outside the race, and all points in between. The weekend had another one. Much smaller than any I've been to, but no less fun as evidenced by all the smiles.
Taken with my Nikon D2x (just cracking the 40k actuations on this) and the truly incredible and versatile 80-200mm f/2.8.