At those words they made a halt to view the unaccountable figure of their opponent; and easily conjecturing, both by his expression and disguise, that the poor gentleman had lost his senses, they were willing to understand the meaning of that strange confession which he would force on them. (188.8.131.52)
When Don Quixote first hits the road, he soon comes across some strangers and decides what the heck, there must be some sort of adventure about to happen. The people, on the other hand, don't know what to make of Don Quixote and figure right away that he must be a crazy old man. You're going to have to get used to that, because that's the general response Don Quixote will get for the rest of the book.