Source: https://www.youtube.com/watch?v=msx3BAhIeQg
Dolphins purposely 'getting high' on pufferfish - Dolphins - Spy in the Pod: Episode 2 - BBC One
More about this programme: http://www.bbc.co.uk/programmes/b03ny6tx Bottlenose dolphins play with toxic pufferfish that secrete a neurotoxin that in high doses can kill but in small doses seemingly have a narcotic effect.