And if it’s not a kid or the town drunk, the first witness will be a scruffy little dog who will start barking madly and scratching at the door (either to get in or out) Then the barking and scratching will suddenly stop.
True enough, to the point their absence is conspicuous.
Or becoming a nigh unstoppable green juggernaut of rage when they become angry.
Another thing to remember: **never **exhibit your monster to the public or perform experiments on it. They will always escape and wreak massive havoc.
It just occured to me that probably every suggestion in this thread is going to show up in the upcoming Monsters Vs. Aliens. 
I saw a fake “powerpoint presentation” somehere linked too, once, where “vampires” accidentally (re)created by gene therapy were said to have about the same problem, and the same cause. [spoiler]In a tongue in cheek moment, they go over how the problem arose when showing the first test subject a test involving random visual images on a black background—each image in the corner, leaving a “+” shaped black cross between them.
Possibly as a coincidence, one of the random images was…a closeup of Jesus being crucified. :smack:
Also, the patient—who they didn’t yet realize had become vampiric—kept resisting the test, and not realizing the problem, the researchers admit later that “strapping him to the chair and clamping his eyes open wasn’t such a good idea. Hindsight, of course, being 20/20.”[/spoiler]
Anyway, back to the topic at hand—
•Standard equipment on planetary landings includes surplus M1 Garands, and frag grenades.
•It’s also possible to launch a manned planetary landing mission…and land on the wrong world entirely, and completely by accident.
•Giant monsters (like lizards and such) are cunning, and tricky beasts—they’ll manage to stalk and attack their prey while looking exactly like they’re taking a half-bored gander around their surroundings, or fleeing from being poked by some unseen giant while feigning to struggle under the weight of their own huge back fin.
•This is the most dangerous, arcane, and outright evil location on the entire planet. This is the place where true horror sleeps…and where it wakes again, to slouch towards the worlds of Man to sate it’s terrible desires.
Everybody in the entire community is Straight and White. All the good guys are Christian, all the bad guys are Atheistic Communists.
The V-2 is the workhorse of the american space industry. Almost every human space trip takes place on it. (Lost Continent, Rocketship X-M, and many others)
I knew what this was going to be even before I clicked on the link. 
Have I watched too many cheesy '50s sci-fi movies?
…naaaaaahhhh. 
Okay, what am I missing with that “arcane, evil, location”? Was it in some movie? Looks like a tunnel mouth to me.
Rely on your dog to put up a fight against the alien menace, but not your cat. In fact, expect your cat to be at the very least a distraction at a critical moment, or more likely, part of the menace itself.
If you shoot a gun in space, the bullet will simply drop to the floor because you have moved away from Earth’s gravity.
–“Abbott and Costello Go to Mars.”
Slow moving monsters, like the mummy have 2 speeds. On Camera and off camera. When off camera, they can REALLY move!
Many monsters, like the mummy, project an ‘anti-tech’ field around their body. This field disables things, like automobiles. Unfortunately for the monster, this field diminishes near the monster itself, usually within 10 feet.
If you are a cute female who wants to live, you must be willing to stand by quietly while some male takes the credit for your idea. You may be forgiven an exasperated shake of the head, but any more than that will get you eaten.