When I was a kid, a woman tried this in the first class cabin, but the staff managed to intercept her and force her back into her seat as the plane pulled away from the gate. The story was, that she was terrified of flying, and chose a trans-atlantic flight for her first flight. The worst part was that her husband was sitting beside her and said and did nothing to either stop her, or console her. The flight attendant kicked her off the plane, with her husband, and their child, who was sitting at the back of the plane in the economy section (WTF?).