Zac's Unstoppable Force
Step one: Hotkey your /laugh to a button. I have my /laugh binded to my Y key.
Step two: Activate Elastic Slingshot and let it reach maximum range.
Step Three: The second you Cast Elastic Slingshot, press Y so that you /laugh.
When done properly, Zac's Slingshot animation is replaced with one of him running VERY FAST while laughing to his landing destination. Since this knocks up enemies, it looks and acts alot like Malphite's Unstoppable Force. Also, it is absolutely hillarious.
Zac player for sometime, just wanted to share this time since I don't think I've ever seen anyone else do it.