And for one good reason.
Great big fuck off land mines.
I often find myself in my quieter moments of deep thought, contemplating what I would have done if those aliens came down to earth (it could happen). What would I do? How would I cope?
The military must have fucking hods of land mines left. I'd use those. Surely they would get under the force fields when those trifuckingpodded twats walked over them. Of course, they take big steps so placement may be a problem. Anti tank mines should be strong enough.
How about a system of hidden ropes set at 5-9ft from the ground? A steel hauser ought to bring those metal fuck-pigs down. Or a buried mortar round set to go straight up when one of the alien gay-boys walks over it. Right up it's fucking jacksie! I can't think of too many things worse than a mortar round up the ringpiece.
So they gave a bit of EMP to fuck our shit up at the start. We could use electricity to fuck up those three legged space niggers good and proper. Some kind of electrical discharge device, like a hidden electricity generator.
Extremist muslims could finally put their suicide bombers to good use. Let them get caught in that basket-net thing and then when the space-bastard sucks them inside they could detonate the charge.
Of course, the coolest thing would be 'tagging' a tripod. Imagine, a space-wog walking around with a crudely drawn cock spray painted on the back of its machine or the words 'I am gay. Kick me hard'.
It is times of extreme trouble that the members of LAB.org would draw together and use their incredible minds and natural survival instincts to fuck the space alien's shit up...