Oscar-winning actor, environmentalist, and wearer of many hats Leonardo DiCaprio has done some crazy things in his life: battled a grizzly bear, surprised Jonah Hill on the street, yachted around the world. But signing up for the world’s first experimental trip to the planet Mars? That seems like an extreme move. And yet.

On Monday at the White House’s South by South Lawn (SXSL) festival of ideas, the actor was engaged in a panel discussion with President Obama and Dr. Katharine Hayhoe, a climate scientist, who joked that it was of paramount importance to preserve our planet, as moving to Mars like entrepreneur Elon Musk had recently pitched wasn’t a realistic option.

“If you’re a human living on this planet—which most of us are, yeah?” she said, according to Inverse. “As long as we haven’t signed up for the trip to Mars—I don’t want to know if anyone has—I think you’re crazy.”

“I did,” DiCaprio joked.

“I think he’ll acknowledge he’s crazy,” Obama added.

To refresh your memory, Musk himself warned that anyone who signed up should be prepared to die. Leo, life on earth seems pretty good for you right now; might we recommend you reconsider the mission? Besides, Matt Damon’s already done it.

[h/t Inverse]

Get The Brief. Sign up to receive the top stories you need to know right now. Please enter a valid email address. Sign Up Now Check the box if you do not wish to receive promotional offers via email from TIME. You can unsubscribe at any time. By signing up you are agreeing to our Terms of Use and Privacy Policy . This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Thank you! For your security, we've sent a confirmation email to the address you entered. Click the link to confirm your subscription and begin receiving our newsletters. If you don't get the confirmation within 10 minutes, please check your spam folder.

Write to Raisa Bruner at raisa.bruner@time.com.