This here is a magic calendar. It will predict where I will be, and at what times, on what days.
Here are some ways you could use this magic for Evil or Good. Your options include:
1 - You could use these predictions to get a hit man to kill me
2 - You could use the magic to find me if you want to date me/ stalk me.
3 - For laughing at me in a publicly accepted context.
4 - Watching me day in, day out, without me knowing at all, for many many years (to no definite end).