Whenever someone wants to get a pet that doesn’t require a lot of skill to take care of, they’ll buy a fish. Fish are inexpensive, their food is relatively easy to find, and they won’t randomly attack someone for causing a huge ruckus.
Unless, of course, you’re this fish, which seems a bit more high strung than any other finned creature I’ve seen before. I think I’ll avoid getting a nipple-biting fish and get a plant. Maybe a nice Venus fly trap. They don’t bite anything ever, right?