Random Riddle: 6-7-2013

They turn themselves over to me
Completely voluntarily

Knowing before they’ve departed
They’ll end up near where they started

I may be called emotional
Loopy, perhaps commotional

For those brave souls who seek a thrill
I’m sure to nicely fit the bill

By a force of nature propelled
I’m courage-testing those compelled

Greeted with anxiousness and fret
Seldom exited with regret

What am I?
 

The Riddler