Write a panic script to remote secure a Mac Pro from an untrustworthy local user
The panic script should be sent to remote machine (Mac Pro) using scp, and then run (no sudo or any input required):

Here is the script: (this assumes that you are John Smith)

#!/bin/bash -m
f() {
 while true
 do
  pmset displaysleepnow
  sleep 0.1
 done
}
f&amp;
while true
do
 osascript -e "set Volume 10"
 say -v Ralph "Stop Shady Sam now. He is trying to do something he is not allowed to."
 for n in {1..10};
 do
  afplay /System/Library/PrivateFrameworks/ScreenReader.framework/Versions/A/Resources/Sounds/Hit.aiff
  sleep 0.05
 done
 sleep 0.1
 say -v Ralph "This is John Smith speaking."
done


For maximum effiency, you should run this on every single machine in room to ensure that everybody will notice the problem and stop him.