Slipknot percussionist Shawn “Clown” Crahan revealed that he needs heart surgery in a new conversation with producer Rick Rubin. The revelation came during an appearance on the podcast Tetragrammaton with Rick Rubin.  In the interview, Clown discussed his seeming inability to exit the band even if he wanted to, with not even this potential heart surgery able to dislodge him from the long-established masked metal act. As transcribed by ThePRP , Clown said the following: “I have a skipping heart and I got to get a surgery. And I found this out after my last tour. I went in, I wasn’t feeling good, and I went in and the nurse was trying to get an EKG thing going on me or whatever and it just wasn’t happening. I kind of fell asleep and I woke up. I’m like, ‘Are you going to get this thing?’ And she’s like, ‘Oh, it’s not working.’ They thought I was having a heart attack right there. Anyway, my heart skips and apparently I’ve taught myself to be like a cross country runner.…