What makes a big sister do what she does?

I gave my youngest boy (age 2) a strip of thick masking tape to keep him busy for a few moments. He gave it to one of his big sisters (age 10). She then tapes his wee wee to his butt.

He walks up to me. I gasp!!

I then have to remove it. Gasp again as it pulls the skin. EECCKK!

It didn't hurt him.

So I want to know why something like this even crossed my daughter's mind. I am again clueless when it comes to her.

Lesson learned, don't give tape to MY children.

Sucessful

I was sucessful by NOT having a baby on Halloween.

Hey, with never ending laundry and house work, I have to look for little things like this to make be feel that I've accomplished something.