Have you ever seen a show where the aliens come down and they go, "We know all about your culture! We've been watching your television shows since the 50s!" and

Have you ever seen a show where the aliens come down and they go, "We know all about your culture! We've been watching your television shows since the 50s!" and then they act really bizarrely because they have no idea what real life is like? See Galaxy Quest for the pinnacle of this trope.