You can't throw curveballs at them. It's entertaining to watch them try, though, because they're prepared and will put them right back in their places. Don't bother trying to insult their knowledge, it'll only put your lack of it on display.
We are nearing one year from the first attempt on President Trump's life. We still know next to nothing about the shooter, and now the incompetent USSS agents there that day are only getting temporary leave.