If you ever read a comic book from the 60s or 70s, you probably heard of sea monkeys a long time ago.
Due to the lack of advertising laws, they were promoted as trainable and a wonderful addition to any family.
The truth is they are brine shrimp, which aren't even a shrimp and are about as trainable as a $21 block of cheddar cheese.
In fact, I'd argue that you could teach the cheese to sit still better than a sea monkey.
We've been trying to bring a sea monkey aquarium to life, with varying degrees of success. (Read, we successfully hatched them, and they carked it when we neglected them for the weekend). But as far as pets go, it's often the weirdest that are the most memorable.