Yamuna : Beginning in 1968, when Srila Prabhupada first taught us the prayer Hari Hari Biphale in San Francisco, until his departure, I had the good fortune of witnessing Srila Prabhupada chant this exceedingly humble song of Narottama Dasa Thakura four times. The last time was at Akash Ganga in 1971. I was holding the microphone up, and watched as he went so deeply into the ecstasy of chanting that he exhibited bodily transformations. His meditation that day was so deep and profound that the skin on his face became slack. His face would just transform into something very different – all from diving deeply into the ocean of that prayerful appeal.
Prabhupada went so deeply chanting Hari Hari Biphale
Reference: Yamuna Devi – A Life of Unalloyed Devotion