Wanna know a fun fact about today? It's National Yo-Yo Day! So get ready to "Walk The Dog" and "Go Around The World" with your fave stars, because we're ringing in this wacky holiday right. First order of business? Let's get everyone Yo-Yo-ing! Well, we don't know if the Nick celebs are actually practicing their skills on strings today, but here's a funny pic of what they might look like doing it!