A couple of blondes went on vacation in Colorado .

They flew to Denver and rented a car to sight see.

One of the sights was a bridge that was more than 1,000 feet above the river.

Walking out onto the bridge, they noticed it swaying in the wind.

Soon after, a car went past and the wood-plank roadway moved beneath their feet.

"I don't think I want to drive the car across this bridge," one blonde said to the other.

"What are you worried about?" the second replied. "It's a rental."