From MP's Holy Grail (some errors):
Gaurd: How did you get that coconut?
Arthur: We found it.
Gaurd: But the coconut's tropical! This is a temperate zone.
Arther: The Sparrow travels South for the winter, and the plumber may seek warmer climates during that time, yet these are not strangers to our land!
Gaurd: Are you sugessting coconut migrate?
Arthur: Not at all. They could be carried.
Gaurd: Carried? By whom?
Arthur: A swallow.
Gaurd: A swallow?
Arthur: It could grip it by the husk.
Gaurd: It's not a question of where 'e grips it. It's a simple question of weight ratios. A 5 oz. bird, could not carry a one pound coconut.
Arthur: Well it doesn't matter. Now will you go and tell you master that-
Gaurd: Listen, in order to maintain airspeed velocity, a swallow has to beat its wings 4 to 8 times t a second, right?
Arthur: I don't care! Now will-
2nd Gaurd: It could be carried by an African Swallow.
Gaurd: Ah, well an African Swallow, yes, but not a European Swallow, that's my point.
2nd Gaurd: Yes, I agree with that.
Arthur: Will you please tell your master that Arthur from the court of Camelot is here!
Gaurd: Of course, African Swallows are non-migratory.
2nd Gaurd: Oh, yeah!
Gaurd: So they couldn't have carried it here.
2nd Gaurd: Wait a minute! What if two swallow carried it together?