If your boss asked you to do something illegal, what would you do?

If your boss asked you to do something illegal, what would you do?

Your boss calls you into the office and tells you your job for the day involves some illegal activity. You question him, and he tells you, "This is your job today. Do it or you're fired."

What would you do?

Updates
+1 y
Several people have said "it depends on what the boss is asking me to do". So, let's clarify by saying that, if you got caught doing it, you would be arrested and probably go to jail.
If your boss asked you to do something illegal, what would you do?
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