Or as we like to call it, "The Particles Are Always Where I'm Looking For Them, But Not Really"
Imagine you're at the local particle accelerator, trying to find the elusive quark. You're like, "Oh, I know I saw it over here, I'm sure of it, I'm positive!"
But nope, it's over here, and then it's over there, and now it's gone. It's like they're playing some cosmic game of hide-and-seek with you.
Or, you know, it's just really good at being uncertain. Either way, it's a real challenge.
Next: Schrödinger's CatOr, if you're feeling adventurous, you can read about Schrödinger's cat's uncle