Here are some of my own parodies:
Beware of Trogdor. He will burninate you.
If you trap Trogdor in a closet, don't let him out.
Thoughts of sodomy make people cry.
While you wait for a terrorist attack, play nethack.
Do not work under any circumstances.
Consumer electronics are available in many time zones.
Nuclear radiation cannot penetrate your cubicle wall.
You will become aware that you are standing in nuclear radiation in 5 minutes, 12 seconds.
Terrorists only attack Whiteys.
In an emergency, karate chop through the door.
Terrorists clearly label their weapons.