I asked Prabhupada, "What does this verse mean?" The verse was, Ya nisa sarva-bhutanam, what is night for all beings is the time of awakening for the self-controlled; and the time of awakening for all beings is night for the introspective sage" (Bhagavad-gita 2.69).
Prabhupada started smiling and said, "Yes. This means that when we see the karmis, we laugh. And when the karmis see us, they laugh. But our laugh is better. We know that they are wrong. They see us, and they think that we are wasting our time chanting Hare Krishna. We see them, and we know that they are wasting their time in material life. Our laugh is best."
Hari-vilasa Prabhu; Srila Prabhupada Remembrances ch. 6