Many people have gotten too close to bison in Yellowstone, often in hopes of snapping an amazing picture, but ended up with serious injuries in the process.

This one comes straight from the Center for Disease Control and Prevention: don't take selfies with the bison in Yellowstone.

Of five people who were gored by bison in Yellowstone in summer 2015, "[t]hree persons sustained injuries while taking photographs at a distance of approximately 3–6 ft (1–2 m) from bison, including two who turned their back on the bison to take the photograph; one person reported taking a cell phone self-portrait (selfie), which necessitated getting close to the animal."