Try it for yourself. I can reproduce this at will.
NBA - Atlanta Hawks/Memphis Grizzlies Box Score Wednesday October 14, 2009 - Yahoo! Sports
load the above up, and than go to another boxscore, without closing IE8, than go back to the original score. At first it will work, but if you leave it there it will go back to your original load. Even when you refresh, you can see the new load, and than the old load overwrites it.
(this is really annoying)