We've often heard that truth is stranger than fiction and that has a lot to do with how unreal reality can seem sometimes.
For instance, you might not expect that frogs or fish could rain from the sky during any time besides a biblical plague but that's exactly what's been documented as happening by none other than the Library of Congress. Unfortunately, we can often find that what seems true to us has a much more fragile basis than we might think.
It's almost like stuff deliberately shows up to make us question what we know after hearing us say, "Everybody knows that couldn't happen" and here are fascinating examples.