Does really Speed thrills?

When you move at high speed, you get adrenaline rushes. naturally, you feel more "thrilled". Remember that roller coaster ride you took when you were a kid? The first time you travelled on the high way? Youths go fast on their bikes because they like the thrill of speed and showing off, and they think that they won't be so unlucky that something bad will happen to them. Of course they don't want accidents too, but they just keep their fingers crossed while riding fast that they won't be the unlucky one.