I don't have the facts to back this up
A lie people tell when they are about to say something that sounds like it came from a toilet.
I said I don’t have the facts to back this up before I told my friends I could fly.
My dad said I don’t have the facts to back this up before he told me he had a pet dragon.
My crush said I don’t have the facts to back this up before she said she was a superhero.