Because you're afraid of them. [his tone isn't teasing, either-- just like he's stating a fact.] Turbulence is normal, yeah? All planes have it. The wind buffering across it or something.

[peter shakes his head.] I guess you really can't?

All you can do is hope the person has enough sense to not crash you into a building. Those guys go through a helluva lotta training before they're allowed to actually pilot a plane.