If you thing that our excuses are lame then please go here:
http://www.automotiveforums.com/vbulletin/index.phpAll images that poped up as not founded were hosted on our server 18 on automotivearticles.com account.
Each image was about 1 Kb. It means that when somebody loads forum list on automotiveforums our web server is requested 50 time at once.
Since images are small it doesn't make any difference whether they exist on the server or just our web server ia queied to get 404 error page.
We have removed their account from the server and killed nameserver entries in order not to get any requests for webserver.
As you know nameservers are often cached by ISPs so when some Automotiveforums visitors go through ISP that cached nameserver entries they again load our webserver.
As long as dns changes propagates load gradually goes away.