They fulfill just any statement. That’s because, as you recall
an empty set just has no members, they don’t exist like me or you,
so anything you say about them, we’ll consider to be true.
Cats with wings can also sing, eight-legged dogs have a third eye,
humans that were born outside the milky-way can easily fly.
Listen, my fourth wife is nine feet tall and also she’s called Ruth.
This is not a lie my friend, in math it’s called a vacuous truth.
Now that you learned what’s a vacuous truth, you can read more comics about math, like this one featuring a wiseguy mathematician in the city.