alien: how do you lot fix eye problems?
human: well, we either wear corrective lenses or use lasers to fix it permanently
alien: huh, neat, I've also seen these stripey labels on a lot of things, what are those?
human: oh, those are barcodes, they get read with lasers so computers can keep track of things
alien: okay... and these long glass strands you use for communications, how do those work?
human: well, we shine lasers down them...
alien: WHAT THE FUCK IS IT WITH YOU PEOPLE AND LASERS?!