“Oh yeah, I’m big into ‘corns,” says Bob Stone (Dwayne Johnson), who’s wearing a T-shirt with a unicorn on it and is delighted to talk about the magical creatures. He’s also happy to talk about his favorite movie, Sixteen Candles, his jorts, and how he’s spent the past 20 years idolizing Calvin (Kevin Hart), the only guy who wasn’t a dick to him in high school…