(from HH Suhotra Swami's weblog)

At the time I was initiated, Srila Prabhupada's personal servant was
Aravinda dasa Brahmacari. He came to a point of perplexity in his service to
His Divine Grace. He was uncertain about how to satisfy Srila Prabhupada in
the different activities he had to perform for him. So he expressed his
doubt to Prabhupada privately; Aravinda became so emotional that he started
to cry in the presence of His Divine Grace. Srila Prabhupada picked up a
pair of karatalas and chanted Hare Krsna and danced around the room.
Aravinda could not help but join in.