Today while on a ride with my son, we stopped side by side on at an intersection and he fell over on me.
He failed to clip out. Turns out a screw had fallen out of his cleat and it just spun instead of releasing. (new shoes and cleats)

He scraped his elbow on the tarmac and my pedal made a very long cut/scrape on his lower back.

in the process, he also broke a spoke on my rear wheel.

Seems like a lot of damage for a zero MPH crash.

His comment when we discovered the missing screw was "my only consolation is that it was my mechanical negligence that caused the incident and not my cycling incompetence."