Turbo Diary

Turbo Diary is an electronic diary by Girltech, a division of Boytech.

History
Lisa watched an advert for it on TV and wanted one after. She asked Homer to buy her one for her birthday, but he got her a personalized video, The Adventures of Lisa Simpson, Girl Cowboy, which upset Lisa as she thought Homer didn't know her at all.

The advert featured a boy called trying to read a girl's Turbo Diary but got an electric shock from it.

Description
The diary has electronic pages which you use a touch pen to write on. When someone other than you, i.e. an "unauthorized user", tried to read the diary, it electric shocks them.