There is a wise money-giver who knows the answer to every question in the infinite set of possible questions except for one. If you ask him any question he knows the answer to, he will tell you. If you prove to him that you are able to ask him the unanswerable question¹ he will produce \$1,000,000 and give it to you. If, however, you ask him a question he does know the answer to but you then amass more than $1,000,000 without that money coming from him you die in exactly 5 minutes.
What can you ask him to gain $1,000,000 and live a normal life span?
¹ The wording "unanswerable question" is not a hint.