It's real and it hurts if you ignore it.
http://www.youtube.com/watch?v=yDu0jYiz-v8
http://www.youtube.com/watch?v=LzDSq6m2zV4
http://www.ntsb.gov/aviationquery/brief.aspx?ev_id=20001214X40670&key=1
http://www.youtube.com/watch?v=yDu0jYiz-v8
http://www.youtube.com/watch?v=LzDSq6m2zV4
http://www.ntsb.gov/aviationquery/brief.aspx?ev_id=20001214X40670&key=1