Adam Levine is known for his signature voice, but he still managed to fool a few local New Yorkers by going in disguise recently. During The Tonight Show on Tuesday, the Maroon 5 singer and his bandmate, James Valentine, joined host Jimmy Fallon [1] as they put on fake beards and gave an impromptu concert in the subway station. While they managed to get an impressive crowd with their cover of "Crazy Little Thing Called Love," fans really started storming when they started singing their hit, "Sugar." Watch it all unfold above.