I don't find any reason for there to be only negative examples. Maybe I'm crazy to say this, but I think it is fine to express the phrase in the affirmative. He was crazy to call after midnight.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
Happy studentI can't seem to find any examples of "crazy to do sth"(without not)Here are some of both: