My dog has issues with doing what he's told... if you call him sometimes he'll come, other times he just won't feel like it, especially if he thinks he has something better to do. One time my dad was across a street and called him, and for once the pup actually does as he's told... but as he was crossing the street this car comes around the corner (running a stop sign) and nails my dog at like 50kph. He flew a good 10 feet, landed on his side, jumped back up and ran into the house. Now he pretty much never comes when he's called.
The driver of the car saw my dad coming towards him looking like he was going to commit untold acts of violence, and sped off down the road. What an asshole.