FOOL'S ERRAND
Completely absurd, pointless or useless errand
While we're at it what other FOOL'S are there?
FOOL'S GOLD
Iron or copper pyrites sometimes mistaken for gold
FOOL'S PARADISE
A state of enjoyment based upon false beliefs or hopes; a state of illusory happiness
FOOL'S PARSLEY
An Old World fetid poisonous plant
FOOL'S CAP
A traditional jester's cap or hood often multicolored and usually having several drooping peaks from which bells are hung. See also DUNCE CAP
Of course the current FOOL'S CAP is the MAGA hat. You didn't know? Uh-oh. Forget I told you.