Dinadayadri: During an ecstatic kirtan in the Los Angeles temple Srila Prabhupada was laughing. Afterwards a devotee asked why he had been laughing and Prabhupada said, "I was laughing to see Narada Muni." The devotee said, "Narada Muni?""Yes, Narada Muni was there.""What was Narada Muni doing?" Prabhupada said, "He was laughing." The devotee said, "Why was he laughing?""He was laughing when he saw the mlecchas and chandalas dancing and chanting Hare Krishna."
Reference:Memories Anecdotes of a Modern Day Saint - Volume 3 by Siddhanta Dasa