Anibusian Mind Transferer
From Tardis Wiki, the free Doctor Who reference
The Anibusian Mind Transferer was a device manufactured by the Anibusians. The user required getting the one they want to swap minds with to write the user's and their names.
Wayne Bland II tricked Iris Wildthyme into using one disguised as a pen, under the pretence that she was signing his copy of the Radio Times Iris Wildthyme Centenary Special. Iris later used it to foil the destruction of Trull by Kragoom. (AUDIO: The Iris Wildthyme Appreciation Society)