He’d gotten together with friends to celebrate his friend who had died, and he mixed mushrooms and alcohol – and days later thought he was dreaming and couldn’t wake up. All he was trying to do was wake up and that’s why he tried to kill the engines, and also tried to open the plane’s emergency exit once taken to the back. He even says that the grabbed a coffee pot from the galley and drank it straight to wake himself up.
While being held by police at the airport he took off all of his clothes, he urinated on himself, and he tried cuffing the carrot… all to ‘wake up.’ When he was given a phone to call an attorney, he instead rang his wife and sang It’s So Hard to Say Goodbye to Yesterday by Boyz II Men.