I had a friend that was a programmer at General Dynamics here in Fort Worth when they got their Cray, he told me he was sure there was a bug when he submitted code and it came right back. But it had compiled successfully.
Also: when Apple bought a Cray, reporters asked Sigmund Cray what he thought about Apple using his computer to design future Apple computer, Cray said "I'm using an Apple computer to design future Crays".