One of my personal favorites is registry fun. Remap his keyboard - only one or two keys (substitute other keys, multiple characters per keystroke, etc.). Use remote registry access to change the person's registry on the fly. Change the default boot order to always boot from another drive. Don't forget the telephone! If you can rig a ringer with a remote control...

Paul G.
SN# 090000587 (40GB Green)
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Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs