“The laws which governed the spontaneous jumps of the kangaroos were shown to be of the simplest; out of any number of kangaroos a certain proportion always jumped within a specified time, and nothing seemed to be able to change this number. Also, before the jumps took place, there was nothing in the world of phenomena to distinguish those kangaroos that were about to jump from those that were not… to help fill the quota demanded by the statistical law. As discontinuity marched into the world of phenomena through one door, causality walked out through another.”

“A theoretical investigation which Einstein published in 1917 provides a third conspicuous landmark. It connected up he two great landmarks already mentioned by showing that the disintegration of radioactive substances is governed by the same laws as the jumps of the kangaroo electrons in the theory of Bohr. In fact radioactive atoms were now seen merely to contain a special breed of kangaroos, much more energetic and ferocious than any that had hitherto been encountered.”

“Numbers are the product of counting. Quantities are the product of measurement. This means that numbers can conceivably be accurate because there is a discontinuity between each integer and the next. Between two and three there is a jump. In the case of quantity there is no such jump, and because jump is missing in the world of quantity it is impossible for any quantity to be exact. You can have exactly three tomatoes. You can never have exactly three gallons of water. Always quantity is approximate.”

“When jumping with a parachute, everyone is afraid. Do not believe those who say that they were not afraid. It is not true, and it would be unnatural”

“Let me introduce myself. My name is, uh, Kangaroo… Kangaroo — Captain Kangaroo … I'm the keeper here of the Treasure House.”

“There is something revolting about the way girls' minds so often jump to marriage long before they jump to love.”

“People did not go jumping from one place to another with nothing in between. It simply did not happen.”

“Isn't it strange how life won't flow, like a river, but moves in jumps, as if it were held back by locks that are opened now and then to let it jump forwards in a kind of flood?”

“You know that the law of gravity will kill you when you jump.”

“I never felt the urge to jump off a bridge, but there are times I have wanted to jump out of my life, out of my skin.”