You can’t teach an old dog new tricks.
You can’t have your cake and eat it too.
You show me the man and I’ll show you the rule.
You can’t win them all.
Your name is mud
Your Guess Is as Good as Mine
You can’t fit a round peg in a square hole.
Your guess is as good as mine
You can lead a horse to water but you can’t make it drink.
You can say that again
