An eccentric billionaire places before you a vial of toxin that, if you drink it, it will make you painfully ill for a day, but will not threaten your life or have any lasting effects.

The billionaire will pay you one million dollars tomorrow morning if, at midnight tonight, you intend to drink the toxin tomorrow afternoon. He emphasizes that you need not drink the toxin to receive the money; in fact, the money will already be in your bank account hours before the time for drinking it arrives, if you succeed.

All you have to do is ... intend at midnight tonight to drink the toxin tomorrow afternoon.

You are perfectly free to change your mind after receiving the money and not drink the toxin.

Can you intend to drink the toxin, if you know you don't have to?