Re: Rock near Demon Drop, record breaking record questions..
Hmmm. Couldn't find the Demon Drop picture you were talking about, and I haven't seen it in person. You got me curious, though. Something to check out when I get there in a couple weeks.
As for your second question, Cedar Point will tell you that Millennium Force broke (I think) ten world records... but half of those records were pretty lame... like breaking the record for most rides in one park (CP already had it), most coasters (again, CP already had it), most coaster track length in one park (ditto).
Californian in Ohio
'08 - Magnum crew
'07 - maXair / Magnum crews
'06 - Wicked Twister / Skyride / Millennium Force crews