Oh! I normally wouldn't encourage such deception, but as long as it's all in good fun, I think I can help a little. I think there's a way to alter your browser memory to directly change your high score if you really wanted to, but that's a bit of a hassle. I would just create a fake screenshot, and share that. After you have a laugh, make sure to come clean! :)
PS: 22,000 is a great score! 50,000 is so high... I don't know if I've even gotten that high a score!