Hear Scooby-Doo Sing Ed Sheeran and the Siri Voice Rap Big Sean on 'Tonight Show'

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Jimmy Fallon on The Tonight Show Starring Jimmy Fallon on March 18, 2015.

Jimmy Fallon made it onto the Billboard Hot 100 last year, and last night on The Tonight Show, he took a look at the bottom of the chart.

After leading with shout outs to Mark Ronson, Ed Sheeran, and Maroon 5, we got treated to the good stuff -- Scooby Doo doo doo-ing Ed Sheeran's "Thinking Out Loud" (which kind of sounded like a Tom Waits cover) and the voice from Siri doing Big Sean's "I Don't Fuck With You."

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The Siri voice is set to play its debut SXSW showcase tonight at 9:30 p.m. at… just kidding.