I shit you not - You say it when the wildest part of a story is true and you'

You say it when the wildest part of a story is true and you're trying to make people believe something that’s ridiculous.

I shit you not, my goldfish took over the internet.

I shit you not, my dog got a PhD in pizza and now it’s a professor.

I shit you not, my teacher turned my math homework into a spaceship.