Guess who? This Knock Woody Woodpecker T-Shirt shows the mischievous cartoon character with a happy expression. The shirt reads "Knock on Wood." Woody Woodpecker made his breakthrough appearance in the 1940 theatrical short titled "Knock Knock" before he was given his own animated series. Woody is one of the most popular cartoon characters of all time. Now, you can show that you are a fan with this Knock Woody Woodpecker T-Shirt!