This is from 2015, but it's just gone viral. It's video of a United Airlines employee pushing a 71-year-old man so hard that he falls flat on his back. It's at Bush Intercontinental Airport in Houston. The employee was charged with a felony for injuring an elderly individual, and the man is currently suing United for $1 million.
(Search for "United Airlines Employee Pushes 71-Year-Old Man." The push happens at 0:32.)