Neat trick, only worked after I relaxed an focused on one spot. Looking for detail didn't allow the effect.
This came up in cracked recently:
http://www.cracked.com/article_19506_6-scary-tricks-that-amazed-us-as-kids-explained-by-science.html
The article on Bloody Mary goes into detail.
This came up in cracked recently:
http://www.cracked.com/article_19506_6-scary-tricks-that-amazed-us-as-kids-explained-by-science.html
The article on Bloody Mary goes into detail.