A man is not a plan
The longest palindrome that doesn't sound like a retarded kid just said it.
'Madam, I'm Adam' is cool, but 'A man, a plan, a canal: Panama' is just a weird palindrome that makes you feel dumb.
He tried to do a palindrome and it took him 10 minutes to figure out it was just a word spelled backward.
That palindrome is so long it's like a sentence from a kid who doesn't know what a palindrome is.