Palindromes

A palindrome is a word or phrase which reads the same backward or forward.

Famous English palindromes:

Single words: 
noon, civic, radar, level, madam

Sentences and phrases:
'A man, a plan, a canal, Panama!'
'Eva, can I stab bats in a cave?'
'Mr. Owl ate my metal worm'
'Was it a car or a cat I saw?'
'A nut for a jar of tuna'
'Do geese see God?'
'A Toyota's a Toyota' 

source: Wikipedia