DOCTRINE OF RES IPSA LOQUITUR:

     Res ipsa loquitur is a rebuttable presumption or inference that the defendant was negligent. The presumption only arises upon proof that the instrumentality causing injury was in the defendant's exclusive control, and that the accident was one (1) which ordinarily does not happen in the absence of negligence. It is a rule of evidence whereby negligence of the alleged wrongdoer may be inferred from the mere fact that the accident happened, provided that the character of the accident and circumstances attending it lead reasonably to the belief that in the absence of negligence it would not have occurred and that the thing which caused injury is shown to have been under the management and control of the alleged wrongdoer. (Bontilao vs. Gerona, G.R. No. 176675, September 15, 2010, Villarama, Jr., J.).