FastCompany interview with John Morreall, a professor at the College of William and Mary, and founder of Humorwork
"A bunch of paint engineers were moaning and bitching about how hard it is to get paint off a house. One guy says, "Why don't we just put gunpowder in the paint and blow it off the house?" That led people to think, "What could we do that would be the equivalent of gunpowder?" They came up with a chemical they added to the paint and when you wanted to remove the paint you did a light wash with a second chemical over the first one. That didn't blow it off the house, but it allowed it to drop off."
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