Years ago my brother got a new riding mower and was showing his son how it worked. Son climbed up to start mowing the field (big ol' yard) and my brother's heart sank when the mower would not start.
Gas is full. Battery seemed to be good the mower wouldn't do a thing.
After about 10 minutes of head scratching my brother sit on the mower and it starts. This time he leaves the mower running as his son gets ready to take the controls. My brother gets up and the the mower quits... Then and only then did he learn of the safety device, and it was disabled in the next few minutes.
Ain't nothing worse than having to stop and get off to pick up a stick, turtle, toy etc and having to restart each time.