Dolphins are hiding a dirty little secret under the waves.

Using hidden cameras, some designed to look like pufferfish, Discovery Channel was able to get up close to a group of teenage bottlenose dolphins for their special Dolphins: Spy in the Pod, and they found some of them may have a bit of a drug problem.

In this clip, a rowdy pod of young dolphins play catch with a real pufferfish, passing around the inflated sea creature. After several minutes of being tossed around, the pufferfish gets angry and releases a fog of neurotoxins. Though lethal when ingested directly, the toxins quickly disperse in the water and become diluted.

Taking in the watered-down neurotoxins, the dolphins start to get a little “groovy.” The pod members take turns passing around the pufferfish, so everyone can get a buzz. After all the dolphins have had a hit, the pod relaxes and the pufferfish escapes.

This footage is the first time dolphins have been caught on camera indulging in recreational “drug” use. Who knows what else they’re hiding.

To learn more, watch the Discovery Channel special Dolphins: Spy in the Pod on Saturday at 8/7c p.m.

This article originally appeared on People.com.

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.

Contact us at letters@time.com.