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Watch: The Lonely Island perform 'I'm On A Boat' with classroom instruments.

Watch: The Lonely Island perform 'I'm On A Boat' with classroom instruments.

In what might be Jimmy Fallon and The Roots’ best ever yet 'Classroom Instruments' version of a song, The Lonely Island have busted out a special rendition of 'I'm On A Boat' that even features... a mermaid.

Watch it all go down below...

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