There are a few simple rules when visiting Yellowstone National Parks. One, is to stay on all marked trails and obey signage. The other, is to stay the f$#k away from wild animals. For example, a video has surfaced online, showing a man attempting to pet a adult bison on it's head. Thankfully, no one was hurt. This "Touron" obviously cant read. (see rule #1)

nps.gov

NOW, ENJOY A VERY INFORMATIVE VIDEO ON HOW TO SURVIVE A TRIP TO YNP.