has this ever happened to anyone before? i'm 100% sure no one else has been using this computer, and just now i found some stuff in my web cache that i have never seen before. it's just tons and tons of pictures from flickr. it seems to be all car/racing related like these:

http://farm4.static.flickr.com/3002/...0f670e1268.jpg
http://farm4.static.flickr.com/3019/...9ee2d818fe.jpg
http://farm4.static.flickr.com/3148/...9c9b7a0803.jpg


i don't even have flickr in my url history... where did these come from???