Rachel McAdams and marijuana aren’t exactly things that most people would pair together, and in a hilarious turn of events, the star quickly found out why!

Stopping by Jimmy Kimmel Live! to promote her film To The Wonder, the new redhead recalled how her grocer tried to help her cure her insomnia with a certain green substance. Keyword: tried!

Related Article: Amanda Seyfried Admits She Drunk On 'Letterman'

Reluctant to even try marijuana at first, Rachel eventually gave in but didn’t exactly get the results she had hoped for. “I take the tiniest teaspoon, brush my teeth, by the time I’m getting into bed I’m like, my brain, ‘What’s happening?’” she recalled. “I wasn’t thinking normal human thoughts. I was hallucinating!”

As strange as that is, what Rachel was actually going through was the stranger part. “I was lying there cursing him. I started to hear opera… for like five hours,” she said. “This guy singing opera in my head. I was going crazy!”

Rachel, obviously not too happy with losing sleep and hallucinating, went back to her grocer to come to one conclusion: he was definitely a stoner!

Well, it's official: Rachel is definitely in the running for our favorite talk show guests, right along with the drunken Amanda Seyfried and Jennifer Lawrence!

What do you think about Rachel’s pot-smoking experience?

Hilarious, or was she being a bit dramatic?