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The portal gun
Absolutely love this thing, Would make my life so much easier, I'd probably keep a portal open between my house and the gym/school/whatever place I visit a lot really
Maybe even shoot one at the moon and go for a walk
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Ray Gun
Yup, If a zombie apocalypse ever arises this will be my no. 1 choice. First saw it in Call of Duty: World at War, In the Nazi Zombie game mode where you could get it from a box to defend yourself from zombies!
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Lightsaber
First seen in the Star Wars movies (beast movies) and later used in the various games released with the Star Wars brand. This has to be probably the coolest weapon I've ever seen in my entire life, Would be running around chopping down all kinds of stuff and awaken the little boy inside of me.