When it appears that you have killed the monster,
never check to see if it's really dead.
If you find that your house a) is built upon or near a
cemetery, b) was once a church that was used for black masses, c)
had previous inhabitants who went mad, committed suicide, or died
in some horrible fashion, or d) had inhabitants who performed
necrophilia or satanic practices, move away immediately.
Never read a book of demon summoning aloud, even as a
joke.
Do not search the basement, especially if the power has just
gone out.
As a general rule, don't solve puzzles that open portals to
Hell.
If you find a town which looks deserted, it's probably that
way for a reason. Take the hint and stay away.
Don't fool with recombinant DNA technology unless you're sure
you know what you are doing.
If you're running from the monster, expect to trip or fall
down at least twice, more if you are of the female persuasion.
Also note that despite the fact that you are running and the
monster is merely shambling along, it's still moving fast enough
to catch up with you.
Do not keep all of your sharpest kitchen knifes in one of
those wooden blocks on your counter top.
When you're searching a house because you think there's
something dangerous there, for God's sake turn the bloody lights
on!
Never back out of one room into another without looking.
Never, ever turn off the paved road onto a gravel or dirt
road.
Always make sure that your car has a fresh battery so it will
start immediately in times of crisis.
Never say that you'll be right back, because you won't.
If anything other than water (blood, green slime, or thick
goo of any color) comes out of a faucet, do not call a plumber.
Leave the house immediately.
If, while looking in a mirror, you a) see a figure behind you
that you don't see upon turning around, b) see a different room
than the one you are in, c) see a figure other than yourself
looking back, or d) hear your reflection tell you to get out
before it's too late, proceed to the nearest exit with all due
haste.
If you open a door and the room you see is not the room that
should be there, do not explore it. In fact, even if you close
the door and see the correct room after re-opening it, vacate the
house.
When in doubt, it's right behind you.
Always check the back seat of your car.
The first time that you are absolutely sure that the
monster/killer is dead or the hellgate is finally closed forever,
you are in the most danger. Don't relax.
Objects moving in a mysterious fashion should be considered a
very bad sign.
If on a stormy night, you find a window open which you
thought was previously closed, do not close it. It may be your
only way out when whatever has come in through it is chasing
you.
If you come into possession of a strange old artifact and any
exotic person (old wizened Oriental, gypsy, Indian medicine man)
warns you to do/not do something, do not do just the opposite in
order to demonstrate how silly they are.
Anniversary nights of executions, horrible murders, or
terrifying rituals should be viewed with fear. Especially on the
spot where the event took place. Most especially on even century
anniversaries. And certainly if you or a friend is somehow
descended from one of the original participants.
If one of your group is missing for a while and, upon
returning, no longer seems as frightened, assuring you that there
is really nothing to be worried about, do not let them get behind
you. They have joined the other team.
If your friend turns into a demon and then suddenly turns
back to normal, kill them because they are not normal!
After you kill the maniac, don't stand anywhere near the body
and don't drop the gun, knife or other instrument of death
because 1) they are not dead; and 2) you will be needing the
instrument of death again.
Kill the person in the group who suggests that you split up.
They will eventually get you killed.
Kill the greedy person in the group. They will eventually get
you killed.
Never, make fun of the local yocal's stories about deformed
killer babies in backwoods townsyou can bet they are real
and you might get it angry.
Never be with the group who plays vicious pranks on the shy,
strange, new kid. Those pranksters will soon meet their doom and
often in a horribly gory way.
If the female or male in your group is too scared to shoot
when the monster is bearing down on you, grab the gun and shoot
the monster yourself or use your weapon to kill both the monster
and your friend, especially if there are more monsters around.
Your friend was dead weight.
Go ahead and slap the screaming hysterical girl. She will be
the one to distract everyone when there really is danger.
Nothing is ever over if it is still nighttime.
If it seems like you have just woken up from a horrible
nightmare, chances are you are still in grave danger.
Take heed of all warnings from animals and children. They
usually know more than you do.
Never run to the top floor of any building if you are being
chased by a maniac/monster. Your only way out will be to
jump.
Never publicly announce your plans for the future if you make
it out alive. It guarantees that you have no future.
Never, under any circumstances, run upstairs if you are being
chased.