Historically I'd say that Hal is NOT known for having much of a sense of humour. He was the serious, committed test-pilot in civilian life, he was the space-cop in his heroic ones. He was straight man to Green Arrow, who was always seen as the much "looser" character (Pontificate. Quip. Angst. Repeat). Humour really isn't something I'd ever associate with Hal's GL career.