If you play radio static, cut a ping- pong ball in half, tape the halves over your eyes and lie down, you'll start hallucinating. - iFunny Brazil
Dr Karl on Twitter: "any truth to this? http://t.co/skLQ3zJfRL @BenBWingrove Why don't you try it, and tell us?" / Twitter
Ganzfeld experiment - Wikipedia
How to hallucinate with ping-pong balls | "I keep seeing a chicken face." 🐔 | By BBC One | Facebook
Ben Wingrove on Twitter: "@DoctorKarl ping pong balls over eyes + static noise + red light + 25 minutes = no hallucinations for me #experiment http://t.co/Ys9ite4jN4" / Twitter