In this Street View photo of 14 Hardgate, Aberdeen, Scotland, there's a purple-shirted boy wearing a horse face. Why?
http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=14+hardgate,aberdeen&sll=54.030966,-2.795663&sspn=0.010045,0.011716&ie=UTF8&hq=&hnear=14+Hardgate,+Aberdeen,+Aberdeen+City+AB10+6,+United+Kingdom&ll=57.13398,-2.115169&spn=0,0.011716&z=16&layer=c&cbll=57.129415,-2.115094&panoid=QggzteTMpstCiTEM6t2QzA&cbp=12,151.42,,1,15.69

Well, if you go back along the street you can see that he put the horse-mask on as he saw the Street View car approaching. Here's the sequence of photos:
http://www.arksark.org/blog/3550/anatomy-of-a-horse-boy/

Don't we all carry something unusual to put on when Street View approaches? If not, we should...

I put this to Very odd category :)