Enjoy this video of the Campo, Colorado tornados courtesy of fellow chaser Ryan Hoke. You can easily see the violent rotation in the first tornado.
There are more hazards to storm chasing than tornados, hail, and lightning. One of the other chasers in my group almost stepped on a prairie rattlesnake. Fortunately, he heard it rattle just in time. We were parked along a busy highway in open cropland watching the third of the Campo, Colorado tornadoes, so the encounter was unexpected to say the least.