I'll eat my hat
A saying used to express how absolutely, positively certain a person is about something.
If she isn't having an affair, I'll eat my hat!
Then i'll eat my hat
Saying that something is (very) unlikely to happen.
If Huckabee becomes president then I'll eat my hat!
Then i'll eat my hat
Saying that something is (very) unlikely to happen.
If Huckabee becomes president then I'll eat my hat!