Daniel accidentally poisoned himself on set of ‘Horns’(fb.com/DanieljacobRadcliffeFanClub) 

Daniel Radcliffe found out the hard way that Canadians mix their trailer water with antifreeze during the winter.

Daniel Radcliffe explained to Conan O’Brien how he accidentally poisoned himself.

The "Harry Potter" star appeared on "Conan" Thursday and confessed to accidentally drinking "non-potable" water on the set of his new film "Horns."

"They don\'t want the water to freeze in the pipes in the trailers overnight, they put antifreeze in it," he explained to host Conan O\'Brien. "So it\'s all non-potable water that comes out of the tap."

Radcliffe wasn\'t aware of this before quenching his thirst.

MTV Daniel Radcliffe stars in new movie ‘Horns’ that debuted at San Diego Comic-Con.

"I did not know that so I drank a full cup," he continued. "So I guess like half antifreeze."

Luckily for the 25-year-old actor he survived to live another day and tell his tale of self-poisoning.

"I got just horrendously ill and didn\'t know why I had become so ill," he said.

"A couple of weeks later I went to drink another glass of water," Radcliffe described, adding how his hair and makeup team yelled, "\'What are you doin!? Don\'t do that. That\'s crazy. You can\'t drink that water.\'"

He concluded by saying the moral of his story is, "Don\'t drink antifreeze."

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