Alien invasion breakdown

"Signs" (2002)

Method of invasion: Skinny grey aliens lurk in Mel Gibson's cornfield. Just slightly scarier than Ray Liotta in “Field of Dreams.”
Objective: Steal humans to become slaves and/or unpaid interns
Lasers? None
Weaknesses: Water, door knobs
Chance of actually happening: 10% (about the same as M. Night Shyamalan making a good movie again)