Kreischer can be seen riding roller coasters and other amusement park rides as well as engaging in activities such as jumping off the Stratosphere tower in Las Vegas and being fired from a human slingshot .
Kreischer suffers from a fear of heights .
Kreischer , who suffers from a fear of heights , can be seen riding roller coasters and other amusement park rides as well as engaging in activities such as jumping off the Stratosphere tower in Las Vegas and being fired from a human slingshot .