1. Equip "Harpoon Gun" (You can use "Grenade Launcher" or anything that cause explosion, but i highly recommend "Harpoon Gun").
2. Load level "The Vault" and find a place that you can see down here:
3. Come closer to the board that marked with red circle on the image above.
4. Shoot the board with your harpoon gun and wait for harpoons to explode.
5. Enjoy (or not) Woody laugh.
P.S. It's important to find exactly this board, because there is similar boards on level, but they won't work.
P.S.S. For those, who just want to see how it looks:



Well, that's all! Thanks for reading this guide.