that sucks. Are you SURE it was him? 'cos frankly, you tend to jump to these conclusions easily and not give people the benefit of the doubt.
anyway, yeah, an alarm-clock watch sounds good. or maybe set an alarm on your macbook- and set a screensaver password.. nobody will be able to turn it off for you.
or this;
http://www.engadget.com/2007/02/13/t...ke-or-go-boom/