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Whenever you hit a ball close to the line and your opponent calls it out walk up to the net and say something like "Are you sure about that?". Stare at the place where the ball hit the court and then, as you shake your head in disbelief, slowly walk back to the baseline. This should be done whenever there is an opportunity for it. The official tennis rules state that if there is a referee available you have the right to call him/her out and demand that s/he assigns a line judge to your court. The purpose of doing this is to make your opponent think twice before s/he makes a call. Unexperienced players often become unsure of their own calls at which point they are easily manipulated.