I believe I have found the VERY FIRST recorded session of the Nitpicker's Corner ...
(King Arthur and his servant Patsy approach a castle. Patsy is using coconut shells to imitate hoofbeats)
Arthur (holding up hand) Whoa, there.
Guard #1 Halt! Who goes there?
Arthur It is I, Arthur, son of Uther Pendragon from the castle of Camelot. King of the Britons, Defeater of the Saxons, Sovereign of all England!
Guard #1 Pull the other one.
Arthur I am, and this is my trusty servant Patsy. We have ridden the length and breadth of the land in search of knights who will join me in my court at Camelot. I must speak with your lord and master.
Guard #1 What, ridden on a horse?
Guard #1 You're using coconuts!
Guard #1 You've got two empty halves of coconut, and you're banging them together.
Arthur So? … we have ridden since the snows of winter covered this land. Through the kingdom of Mercia, through …
Guard #1 Where'd you get the coconuts?
Arthur We found them.
Guard #1 Found them?! … in Mercia? The coconut's tropical!
Arthur What do you mean?
Guard #1 Well, this is a temperate zone.
Arthur The swallow may fly south with the sun, or the house martin or the plover may seek warmer climes in winter, yet these are not strangers to our land.
Guard #1 Are you suggesting coconuts migrate?
Arthur Not at all. They could be carried.
Guard #1 What?! … a swallow carrying a coconut?
Arthur It could grip it by the husk.
Guard #1 It's not a question of where he grips it … it's a simple question of weight ratios. A five-ounce bird cannot carry a one-pound coconut!
Arthur Well, it doesn't matter. Will you go and tell your master that Arthur from the Court of Camelot is here.
Guard #1 Listen, in order to maintain air-speed velocity, a swallow needs to beat its wings 43 times every second, right?
Guard #1 Am I right?
Arthur I'm not interested!
Guard #2 It could be carried by an African swallow.
Guard #1 Oh yeah, an African swallow, maybe. But not a European swallow, that's my point.
Guard #2 Oh yeah, I agree with that.
Arthur Will you ask your master if he wants to join my court at Camelot?
Guard #1 But then, of course, the African swallows are non-migratory.
Guard #2 Oh, yeah.
Guard #1 So they couldn't bring a coconut back, anyway.
(Arthur and Patsy "ride" off in disgust)
Guard #3 Wait a minute … supposing two swallows carried it together?
Guard #1 No, they'd have to have it on a line.
Guard #3 Well, simple … they just use a strand of creeper.
Guard #1 What, held under the dorsal guiding feathers?
Guard #3 Well, why not?