I read from a friend on Facebook (working in aquarium):

People are very strange creatures. Today in a store, a woman with a 5-year-old daughter sticks into a fish and asks:
What is the name of this fish?
“Pseudomugil Gertrude,” I answered.
The woman is hysterical, angry and leaves. At the exit I hear from the edge of the ear that, it turns out, I had to ask her what the name of this fish is, to answer whether this fish belongs to guppies or not. And, it turns out, it is all my fault that I answered the straight question.