Audrey raised her hand again. "Well, Professor, I can think of one situation. Say someone was impersonating another using Polyjuice Potion, and they needed to make sure the person they were pretending to be did not wake up while they were still under the potion's effects. They could just give them some of this potion, and then they'd have no problems!"

Realizing this idea was a bit far-fetched, she blushed.