My instructor was a 4000 hour pilot, about half in the OH6 with service in Vietnam and the rest civilian. We were doing a night XC and had departed KGBR. As I climbed through 4000' to get a comfortable height over the hills (for me) in the black hole, he shines his light over to the altimeter and asks how high I'm going. Then says "you are scaring me! I've never been this high." He was probably kidding.