My passion is roller coasters because they are really fun to ride.  I think that roller coasters are fun because they go really fast.  My first roller coaster ride was when I was 3 years old.  I cried because it was pretty scary for a 3 year old.  The fastest roller coaster in the world is Formula Rosa.  It goes at a speed of 149.9 mph.  I think going up is more scary than going down because going down can give you a tummy tickle.