A palindrome is a word, line or verse which reads the same backwards as forward. The above video shows some text which when read forward has the exact opposite meaning as when read backwards.
This is a video that apparently was submitted in a contest by a 20-year old. The contest was titled "u @ 50" by AARP and this video won second place. When they showed it, everyone in the room was awe-struck and broke into spontaneous applause. So simple and yet so brilliant.
Take 1 minute and 44 seconds and watch it.