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Or, at the very least, it was the first time they heard it in a long time.
I Knew It: Ever since Hasbro released a Rainbow Dash toy with a turtle for a pet, fans speculated that it would be Dash's pet here. While Tank is a tortoise, not a turtle, he's close enough to count. Then again, the animation team and the toy department are completely separate (and the latter has less creative freedom), so it's most likely either a coincidence or a friendly Take That.