June 10, 2015 12:24 PM EDT

Tuesday’s episode of The Tonight Show featured a particularly absurd round of “Nonsense Karaoke,” a segment in which Fallon and his guests sing pop songs with rewritten lyrics.

First up was Molly Shannon, who sang “Waterfalls” by TLC. The chorus, however, went from “Don’t go chasin’ waterfalls” to “Don’t throw Jason’s Barbie Dolls.” Just because. Next up was Denis Leary, who performed “Pour Some Sugar On Me” by Def Leppard. His chorus became “Ask your sister for peas in a baseball glove / Play some Boggle with Jeeves and his hairless pug.”

Finally, Fallon took on Ed Sheeran’s “Thinking Out Loud.” Get ready, because it’s super weird.

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