In Brandon v. State, 241 Ga. App. 887, 889 (2) (528 S.E.2d 809) (2000) defendant testified and told an improbable story in light of the evidence against him. Id. at 888. "We have held that this exception applies in only extraordinary cases, . . . and only for statements which run contrary to natural law and the universal experience of mankind." Brandon, supra at 889 (2). Moreover, this charge tends to discredit a witness's testimony in the eyes of the jurors and can "confuse the jury as to the real issues." Dixie-Ohio Express v. Brackett, 106 Ga. App. 862, 874 (128 S.E.2d 642) (1962).