"Every bubble is the product of some form of irrational exuberance."
—Matthew Bishop, Essential Economics: An A to Z Guide (2009)

"Underlying every bubble is what I call a Big Truth."
—Peter Atwater, Moods and Markets: A New Way to Invest in Good Times and in Bad (2012)

"Every bubble is coming from the atman, soul, your being."
—Paramahamsa Nithyananda, Guaranteed Enlightenment (2009)

"Most bubbles are very friendly."
—David Lewman, SpongeBob SquarePants Survival Guide (2002)

[Our illustration is from Nursery Nonsense, or Rhymes Without Reason by D'Arcy Wentworth Thompson, 1864.]