Never take medical advice from your grocer in Montreal! That's the lesson of Rachel McAdams's hilarious weed story, as shared on Monday's Jimmy Kimmel Live.

Rachel, who showed off her lovely new red hair, told Jimmy she was having insomnia issues, and her grocer suggested she take some of this green stuff he had in a jar. Yep, it was marijuana. "I was like 'Oh, no, no, no,'" Rachel said, "'I want to sleep. I don't want to get high.' And he said 'No, no, no. This will put you to sleep. It's not going to get you high.'"

She was pretty desperate at the time, so that night, she said, “I take the tiniest teaspoon, brush my teeth, by the time I’m getting into bed I’m like, my brain, ‘What’s happening?’ I was not thinking normal human thoughts." Jimmy asked if she was hallucinating. "I was hallucinating!" Rachel said. "I was totally hallucinating. And I'm just laying there like, cursing him. I can't believe this is happening. And then I started to hear opera. For like five hours, I heard opera. This guy singing opera in my head. I was going crazy!"

Ha! She should've called Ryan Gosling at that point, to ask for his help and advice. Or just because he's Ryan and they belong together. But that's off-topic. Watch her video here to see more.

Source: Gossip Cop