This reminds me of something my granny once told me.
When I was just a toddler I thought it would be fun to watch her cut the grass.
Well, that didn’t sit well with her.
In order to discourage me from such activity she told me she once knew a little boy who was watching his father cut the grass. Suddenly, the blade came off the mower, whirled through the air and chopped that little boy’s head off.
I found something else entertaining to do.
Your “granny” had one hell of a sense of humor.