The yak gets suddenly wary at your advance. "Hey!" it snaps. "What makes you think I'm going to let you shave me?"
"I'm certified," you suggest.
The yak gives you a dubious look. "Like I haven't heard that one before. You want to stop insulting my intelligence, or do I have to get nasty?" It menacingly huffs and paws at the roof. Uh oh.