I was out walking with a non-religious friend one time and while discussing different things, I called out the name of Satan.
Instantly, at that very second, we both physically ducked down as we each felt a terrifyingly evil presence upon us.
It was an involuntary ducking down, just as you would if there was a nearby and unexpected explosion.
He looked at me with a "WTH just happened?"look. It was just as if the dark lord himself had come to see who was calling him. To say our flesh crawled is a huge understatement - it was truly fearful and I'll never forget it.
Splash