Stephen Colbert of the Colbert Report recently testified before a congressional subcommittee regarding illegal immigration and migrant workers. What he presents is a brilliant piece of satire (regardless of whether or not you agree with his conclusions).
David Philips analyzes the satire thoroughly here. He shows that satire is a valid and historic form of communication that even Jesus was willing to use. I would add that humor allows us to communicate past some natural barriers. There are things that Colbert can say through satire that would be much more difficult to say seriously.
You can watch the video below. What ways could we use satire to communicate difficult truths?