The ox that is loose is best licked.
Sancho, who had been attentive to the student's discourse, said: "Tell me, sir—so may heaven send you good luck with your books—can you resolve me—but I know you can, since you know every thing—who was the first man that scratched his head? I for my part am of opinion it must have been our father Adam."
"Certainly," answered the scholar; "for there is no doubt but Adam had a head and hair; and, this being granted, he, being the first man in the world, must needs have been the first who scratched his head."
"That is what I think," said Sancho; "but tell me now, who was the first tumbler in the world?"
"Truly, brother," answered the scholar, "I cannot determine that point till I have given it some consideration, which I will surely do when I return to my books, and will satisfy you when we see each other again, for I hope this will not be the last time."
"Look ye, sir," replied Sancho, "be at no trouble about the matter, for I have already hit upon the answer to my question. Know, then, that the first tumbler was Lucifer, when he was cast or thrown headlong from heaven, and came tumbling down to the lowest abyss."
"Sancho," quoth Don Quixote, "thou hast said more than thou art aware of; for some there are who bestow much labor in examining and explaining things which when known are not worth recollecting."