I'll eat my hat!

eat (one's) hat

A humorous action that one will allegedly take if something very unlikely happens. Kevin is always late, so if he actually shows up on time, I'll eat my hat.
See also: eat, hat
Farlex Dictionary of Idioms.

I’ll eat my ˈhat!

(spoken) used to say that you think something is very unlikely to happen: They’re always late — if they get here before eight o’clock, I’ll eat my hat.
See also: eat
Farlex Partner Idioms Dictionary
See also:
  • see the funny side (of something)
  • see the funny side of something
  • sliced bread
  • the best thing since sliced bread
  • greatest thing since indoor plumbing
  • greatest thing since sliced bread
  • greatest thing since sliced bread, the
  • indoor
  • meals rejected by Ethiopians
  • reject
References in periodicals archive
The tournament truly sparked to life in the heavyweight clash between Spain and Portugal, and if there's a finer game in this tournament I'll eat my hat! Cristiano Ronaldo once again proved himself as the best player to have ever graced this planet with a scintillating hat trick, including a late trademark free kick to rescue a point.
Game on!
''If I can't answer one question I'll eat my hat!'' Kelly bragged.
TALES FROM THE PAST; Flash back
"I've had guys say to me already, 'If you play until you're 30 I'll eat my hat!' "But look, if I make 30 I will be happy.
Why I won't be joining the Welsh exodus on French soil - Warburton
"I've had guys say to me already 'if you play until you're 30 I'll eat my hat!' But look, if I make 30 I will be happy.
Sam sets out 20-game plan to combat star burnout
If they don't win the lot I'll eat my hat! sammykims Massive spending yet nothing in the department that lacks most, defence.
QUESTION OF THE DAY; Can big-spending Real Madrid sweep all before them this season?
"Manchester United are nowhere near the top and if the season finishes like that I'll eat my hat!" said Davies.
Davies won't get carried away; VILLA NEWS
If he wins I'll eat my hat! (Ed: We'll look forward to that then...).
Golf: Open and shut case on Harri
DCC put on a show second to none and if we don't see the Australians there before long I'll eat my hat!
Bring on the Aussies!