If video games have taught me anything, it's that when the invasion arrives, all you have to do is lop their heads off with various kitchen utensils, grab any and all weapons and first-aid kits that will appear as if by magic on the street, until you get hold of the BFG and can blow their heads off one by one, whilst sitting on your rooftop drinking your finest Cabernet.

"Can you climb, motherflipper?" BANG! "Nah, didn't think so. Ooo, this vintage is exquisite!"