What pieces of fictional technology do you wish were real?

The terran artifact weaponry that allowed you to time travel. In the book "the penultimate truth" by phillip k dick. :D
 
Are they hot enough to slice someone's body in two?

PS : The sfx are a necessary 'coolness' feature.

I just googled it and can't find it. I think someone may have been pulling my leg. :p

Could have sworn someone told me that there is something similar that has a sort of beam that can slice through soft metal.
 
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