this guy is lucky cuz the one time i played bloody mary by myself (i locked the doors, lights out, everything) about 3 seconds after i chanted bloody mary, the lights flickered on and the window cracked from the top left to the bottom right...i nearly pissed myself! give or take a half second for me to leave. [This is a true story, you can quote me on it.]
There are a ton of thoughts on bloody mary. Some say she lets you speak to a dead person of your choice until 11:08am(or pm I forget). Others say she can show you the future(children and marriage wise). Then we get the scary stories. Personally, I love the idea of them all.