Anyone who has lived in Oklahoma since the late '70s and was paying any attention at all has seen, first hand, the boom and bust cycle of the oil and gas industry, whether you were directly involved in it or not. (Or am I the only one who remembers the gallows humor that was pervasive in the early '80s, like "will the last person leaving Oklahoma please turn out the lights" and "I bank at FDIC--new branches opening daily!")
LOL, I retired off of that thinking. Buy when its in the tank, and reap the benefits when its up.