Examples:

• Why does Kerry always shoot herself in the foot by saying the wrong thing?
• I think you might be shooting yourself in the foot if you don't take his offer.
• He'd have a real shot at winning the election if he didn't keep shooting himself in the foot with such inflammatory remarks.
• The Minister of Agriculture shot himself in the foot by saying that farmers couldn't understand economics because they weren't educated. He resigned soon after.
• Unless he shoots himself in the foot, in all probability he will become President.
• The government seems to have shot itself in the foot over this issue.
• I think we shot ourselves in the foot by firing her, because she knew more about the project than anyone else.
• Men shot themselves in the foot, like in wartime.