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Tech bros holding flashlights under their chins: Guys, what if le Skynet, what if le Gray Goo??!!
(hexbear.net)
WHAT IF OUR AUTO-COMPLETE CHATBOTS DECIDE TO KILL OFF HUMANITY BEFORE WE EVER BECOME A TYPE 1 CIVILISATION 
Climate change: 
What if perfect copy of you made by vengeful robot god of the future that wants to punish you for not being enthusiastic enough about building the vengeful robot god of the future... and that perfect copy is tortured in weird creepy ways because techbros want to make a vengeful robot god of the future with the same pathology as themselves?
That doesn't scare you? But it's a perfect copy which is literally the same thing as you! Fine, how about a million copies of you? That's a million times as scary, I did the math!