The Deference Pattern of Waves

When we shoot electrons, particles at two slits, what pattern do we see? We see exactly the same pattern we would see with waves. The only way you can create that pattern is if the electron went through both slits at the same time. That's insane. It's like infinity. So I put a light there, and I shine it. What happens? I see each electron goes through only one slit or the other. Aha! I proved that it doesn't go through both. But then when I look at the pattern, the pattern is different. If I don't shine the light on the electron, thepattern is different. Now that's crazy because electrons have particles