Blog of Phyz posts on SciVals can be found here. At the Berkeley Show & Tell, I passed out "quarter-sheet" prints of the Scientist Valentines (printed 4 per letter-size sheet of paper).
Here's the source PDF for those.
Richard Wiseman demonstrated this phenomenon to us at The Amaz!ng Meeting 4 (2006). The context: including skepticism/critical thinking lessons into the physics curriculum is time well spent. One theme worthy of exploration is the fallibility of our cognitive processes, including our ability to create patterns where none exist; pareidolia. This exercise in back masking is audio pareidolia.
Jeff Milner has created and maintained a great page of back masking examples with appropriate user controls. Note: some clips are more compelling than others.
Here's an interactive Quicktime of the presentation, which featured Lady Gaga, Britney Spears, and Led Zeppelin.
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