That happens only if your IP is traffic-flooding at an especially high rate. In your case, I see that your IP attempted to make 1340 requests in a 120-second period starting at 08:25 UTC. This is far above the general limit of 1 request per second.
That
huge number of requests made me think it includes Bitcointalk's image proxy. I tested it, and clicked through
[Discussion] Bitcoin Pizza Day on Bitcointalk 🍕. On
page 15 already, I got Error 1015 again.
I guess it's time for me to hit the couch now, that was my plan anyway so I could "safely" see if I can reproduce this.
Maybe someone else is using your IP to flood, or maybe you have some background process running which is making requests way too quickly.
Nope, nobody else is using my IP and all my background scripts run on a VPS.
Is this the intended behaviour? If opening 15 pages with images (within maybe 10-20 seconds) creates 1000+ requests, I'd say that isn't really the user's fault. I opened 15 pages, the 1000+ requests are caused by the content of those pages.
Now that I think about it: it wouldn't be too difficult to embed 1000+ images on one page. Does that mean anyone who opens that page will get a 1 hour break from Bitcointalk? Suddenly I have an evil plan for April Fools day 
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