The top of the Cylinder begins moving, rotating, unscrewing.
When suddenly the lid falls off. A tall funnel rises from inside, and an invisible ray of heat leaps from man to man, instantly turning them to fire. Luckily you're well hidden and far enough away to escape.
You return to the safety of your home when you feel the ground begin to shake. Looking outside, you see a giant Martian Fighting Machine, higher than the tallest steeple. You need to leave now before it tramples on your house with you inside.
You have time to grab one object before you leave. What do you take?