From what that I hear

Fairies usually forget things. And if they were promised something, they won't remember much of it on the next day.

When there's an interesting human around, I'd invite the others. But everyone is too busy playing so nobody wants to prank.

Well, that much is true...

Besides,

When I call the others cause I saw a strange fairy flying around.

It feels like nobody listens to me, and then suddenly...

So!

With that said, you're the first kind of fairy who does such a thing.

Well, you can say that this is just a hobby of mine.