Sort of like a lot of the folks who argue. They often use the same lines and ideas, even if they don't know of it works. The people they mimic said it, so they will too.

It's common enough that we forget we have it. Walking is mimic behavior. Babies watch others walk and decide to copy it. If they didn't see others walking, they wouldn't try.

Honestly, it does seem like a bit of an act. But, I'm fairly certain a lot of viral videos are acts or edited to look like things, so it's hard to guess.