I have scared many people *****less in their cars, not to mention my own.
If they ask to see what I can do with a car while they occupy the co-pilot's seat, they are in for quite a ride.
I have done the 'driving instructor' thing a couple times since I took the 930 off the road. You often have to show people their car's limits in order to teach them to push the envelope.
Don't feel bad about getting the guy a little excited. If he came back alive and didn't beg you to slow down during the ride he probably enjoyed it.
Hell, I have known a few women who have gotten quite aroused after a good e-ticket ride.