Migrating coconuts?
The following quote comes from a student's essay on alcohol consumption in Chrétien de Troyes' Arthurian Romances and the Lais of Marie de France.

For the more common folk, using a coconut was immensely popular throughout the Middle Ages as it served both a functional use, and was thought to have medicinal purposes in using it.

All together now:

"Where'd you get the coconuts?"

"We found them."

"Found them? In Mercia? The coconut's tropical!"

"What do you mean?"

"Well, this is a temperate zone."

"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?"

"Are you suggesting coconuts migrate?"

"Not at all. They could be carried."

"What? A swallow carrying a coconut?"

"It could grip it by the husk!"

I don't know if I'll get to the library before handing the essays back, but for future reference, I'm going to have to look up this footnote: Gerard Brett, Dinner is Served: A History of Dining in England 1400-1900 (London: Rupert Hart Davis, 1968), 75.