The following haikus are from freakomomics website:
No. 1, posted by Tim:
Demand curve slopes down
Because the more cake I eat,
The less cake I want.
No. 2, posted by Calum:
A friend and I, jailed;
We agreed to stay silent
(But I still confessed).
No. 3, posted by LiaStarLight:
No matter how hard
I shake my money maker,
It is not enough.
No. 4, posted by Nate C.:
Sales of ice cream seem
To correlate with crime rate?
Simply summer heat.
No. 5, posted by Sean:
Can we work it out
If there aren’t transaction costs?
But of Coase we can.
No. 6, posted by Sophie:
Haiku writers know
The opportunity cost
Of a syllable.