Melissa McCarthy [1] could literally make dirt funny. The hilarious actress stopped by The Late Late Show With James Corden on Wednesday to promote her new movie, The Boss, and ended up chatting with the host while wearing a mouthguard. Even though the result looks like something straight out of a horror film, she makes up for our evident nightmares by vigorously trying to blow bubbles. Let's just say, you shouldn't watch this while drinking your coffee. See the full video above, and then check out her incredible Lip Sync Battle against Jimmy Fallon [2].