This is a phrase that haunts people everywhere. Children and adults alike are all terrified when they hear this. If you've looked this up, then you're either traumatized already or about to be traumatized.
When I heard someone say "I feel fantastic, hey hey hey hey," I instantly screamed and ran away.
A term from a creepy YouTube video of a scary android singing uploaded in 2009
User1: Did you ever see that one creepy vid of that android singing?
User2: I feel fantastic?
User1: Yeah, that's the one!