What are some good examples/activities that demonstrate confirmation bias?

I'm trying to come up with some good examples or activities to demonstrate confirmation bias for my psychology class. Does anyone have any idea ? Thanks!|||The whole George W Bush and weapons of mass destruction in Iraq debacle is a great example of confirmation bias. Bush and/or his advisers badly wanted a reason to invade Iraq. So they jumped on evidence which suggested WMDs there and discounted evidence to the contrary.