This is why I exclusively fly Southwest. The flight attendants always tell jokes with the announcements, and generally make sure you have an enjoyable flight. They have good rates, and even give you two checked bags for no additional charge!
I just flew with them last week -- most memorable one the flight attendant said: "There's a thousand ways to leave a lover, but only 6 ways off this aircraft!"
Never had the flight attendant rap before, though! I'm flying SW to OKC in July, maybe I'll get lucky.