Here's a weird one. And I've been able to duplicate the problem.

I'm browsing a MyBB php-based message board. I post a message and it takes
me to a confirmation page ("Your message has been posted... now returning you
to the thread"), then it forwards me back to the thread and to my message.
The URL consists of the php file, a thread id, a post id, and an anchor to
the post id... something like this:

http://sld.tld/showthread.php?thread...postIDyyyyyyyy

While that is loading, I close the tab. Why? Because I had opened that
thread in a separate tab and I've already read the thread. But, by closing
that tab while the page is loading, I set off an infinite loop of new tabs.
It appears that IE is determined to deliver me to that page anchor. Suddenly
one tab after another starts opening and taking me to that link, at a rate of
about 2/second. I'm unable to kill the tabs as they open and my only
recourse is to open task manager and kill IE altogether.

Anybody seen this?

[i.e. 7 on XP 32 sp2]

If anyone from MSFT wants to give me contact info I'll be happy to provide
the BBS on which this has occurrred so they may duplicate and figure out what
the bug is.