The unusual happening about which plaintiff complains might have been produced by any one of several causes, but the sufficiency of the evidence does not depend upon the doctrine of chances. S. v. Prince, 182 N. C., 788, 108 S. E., 330. We concur in the conclusion of the court below that there is no sufficient evidence of any negligent act by defendant from which it could foresee that injury was likely to occur.

The court below did not find as a fact that the witness Braswell was an expert. The exclusion of his opinion testimony, based upon a hypothetical question, cannot be held for error.

The judgment of nonsuit is

Affirmed.