Cockamamie question #1 : You open your eyes and you are a great white shark, how could you convince people you are a human being trapped in a shark's body?

Say, that’s just it. You maybe are lonely and needs interaction with humans or you need to let family know you are still around or you need to tell someone you were murdered and came back as a fish who happens to have a killer smile-? Heh. Here’s hoping you have a bit of fun with this one. : )