Why do bugs disappear the moment you show someone?

You've been battling the exact same glitch for three hours. You call a colleague over. "Look, it keeps failing right here..." It runs perfectly. Instantly. Now you look like you made the whole thing up. Developers call it the "demo effect." It's easy to laugh off, but there's a deeper human truth hidden in it. The moment you try to explain a problem out loud to someone else, your brain rewires how it sees the obstacle. You don't always need new answers. Sometimes you just need to stop staring at the screen alone.