That's actually not as dumb as it may sound. There are some smaller species of shark that people could keep as pets if they had the time and money granted it wouldn't be a very common pet. Also, there are a group of small freshwater fish called commonly called "sharks" because there body shape resembles that of sharks though they are actually related to Carp. I actually used to have a few of these. Here's a picture. The silver and black one is a bala shark while near the bottom right is the tail of my red-tailed black shark (it's tail was actually orange)
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