<font color=navy>When I was quite young an older cousin introduced me to "Mary Mischief Maker" who was quite tiny and could fly around the room.
Mary Mischief Maker (and yes, I called her by her full name at all times

) kept me company for many years, and she & I had fun. I used to imagine her sitting on my shoulder, flying around the room, perching on the teacher's shoulder, etc.
Fast forward to x number of years, my older cousin now has a family, and I got the idea to send her little son secret pal notes. I did this for a year, and at the end, I revealed myself as Mary Mischief Maker, and how I was always around him and ready to have fun.
Well, about a week after I sent the last note, I got a call from my cousin. I thought she was going to tell me what fun they had with the notes. It turned out that they had the police in their living room because they thought someone was stalking their 5 year old.

I had told my aunt/her mom about the notes I was sending a few months earlier, but when they were trying to figure out who was sending them, my aunt had forgotten all about that conversation.

She remembered it after I reminded her.
They said that when they were talking to the police, the plice were first trying to concentrate on a friendly person sending the notes, and then my cousins thought of me ... said that after thinking it over it seemed like something I would do.
So, here I was all year, smiling to myself about the fun they would be having trying to figure out the secret pal, and in the meantime, they were so concerned about some pervert who called him/herself "Mary Mischief Maker!!! Ooops.

... and my cousin had grown up long ago and left our imaginary friend behind - it took her awhile to remember her when I reminded her that she was the one who introduced us!
When they realized it was me, everything was okay.
I never sent a secret pal card again, though.