Hippie told Srila Prabhupada to chant Hare Krishna
Bhakti Charu: In spite of being the world acharya, Srila Prabhupada was humble.
Once in Amsterdam, when Prabhupada was about to give initiation, the devotees hadn't organized things properly and were making mistakes at every step. Prabhupada was getting increasingly annoyed and when he saw that the sacrificial altar had no fruits on it, he was further disappointed. One devotee ran to the kitchen, cut some fruits and gave the fruit to Srila Prabhupada. Prabhupada got still more upset because such fruits are supposed to be uncut. A hippie who used to come to the temple regularly was present, and he had noticed that whenever someone became upset, the devotees would tell that person, "Why don't you chant Hare Krishna?" When this hippie saw that Prabhupada was agitated, he told Prabhupada, "Why don't you chant Hare Krishna?" Prabhupada quietly took his bead bag and started to chant.
Reference:Memories Anecdotes of a Modern Day Saint - Volume 3 by Bhakti Caru Swami