I'm going to prank my mother on mother's day by calling her pretending to be the police telling her that her son had died in a horrible accident
Do you think it is cruel to prank you Mom thinking you are dead?
There's nothing wrong with a good prank on a special celebration.
It is understandable to want to prank others because it is fun. But you should not prank unsuspecting people especially your mother with a cruel prank. Plus it is wrong to make others think you are dead.
It's a harmless prank. She would be stupid to believe it.
I think as a mother she would believe it instantly because mother's first instinct is to think the worst. It would be more strange if she didn't care or assumed it wasn't real.