Posted: Jan 11, 2017 2:55 pm
That's only happened to me once. I still have the scar on my forehead sustained from walking at a brisk pace into a brick wall.
Lifeboat for the rational mind :D
http://www.rationalskepticism.org/
http://www.rationalskepticism.org/viewtopic.php?p=2512601#p2512601