EXAMPLE:
A SUV with a
bumper sticker that says keep earth green. (Example not created by me.)
This shows irony because SUVs tend to use up a lot of gas, therefore poluting the earth; it is, in essence, the opposite of what the sign said, advising others to keep the earth unpoluted.
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"The zookeepers were trapped in the huge gymroom."
The irony is based on the fact zookeepers are the workers of a business thats purpose is to keep animals caged. Now,
the people who cause this upon others are now in the same state themselves.
This is a more subtle form of irony.