Jimmy Kimmel celebrated the fifth anniversary of his show Jimmy Kimmel Live on Thursday, and to help him celebrate, his girlfriend Sarah Silverman made him a present.

The present? A music video, starring her and Matt Damon, where she sings, “I’m f—king Matt Damon … I’m not imagining it’s you.” It was the funniest thing I’ve ever heard her do. I’ve watched it several times now, it’s hilarious. It’s no wonder that it has become a hit on YouTube.

Jimmy Kimmel’s response?

“I hope they’re happy together!” he said in a statement.

Watch the video here.