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Take a race car, something like a Jaguar XJ9 on El Capitan (Normal)and follow similar race cars through the tunnel and down the hill to the bottom. Then get the car turned around and wait. You'll have to time your collision point but 2 or 3 tries will yield some savory reults. At full speed take the car through the first right, then left up the hill. With any luck, you'll clip the other car as he comes over the hill. The result will be a good 40 feet of airtime, maybe more. If you miss, you can do up to a full 720 degree rotation before landing unless you clip a car on the way down as you're rotating mid-air. Obviously this isn't for everyone, but me and my 5 year old daughter just can't get enough of it!