Dwayne Johnson sure loves picking on Kevin Hart, and we can't get enough of it. On Thursday, The Rock posted a video on Instagram of him scaring his Jumanji costar on set. "Watch @kevinhart4real jump!😂😂," he captioned the clip. "He's terrified of all the biting centipedes and venomous spiders in our jungle, so what does any good friend do? F*ck with him." Let's just say, if the movie is anywhere near as funny as their posts on social media, we're in for a real treat.