What do you do? The only catch is that they have to be things of a reasonable size (i.e. no buildings falling from the sky, no AC-130s, no large animals) and they cannot be either other people or things that require other people.
Oh, and to make things slightly more interesting, you are not allowed to just say "a gun", but rather you have to say the exact type of gun.
EDIT: Forgot to mention, the Spartans want to kill you for some reason. Let's say you trod on the Spartan Commander's toe, and he got really pissed.