From Scene 1 of "Monty Python and the Holy Grail":
SOLDIER #1: Listen. In order to maintain air-speed velocity, a swallow needs to beat its wings forty-three times every second, right?Nope, it's about 15 beats a second at cruise, according to the article. ( Found via Utterly Boring. I told you in the link opposite that it isn't.)
SOLDIER #1 : Am I right?