153 A. 770 Perry v. Ryback, Appellant. Supreme Court of Pennsylvania.December 3, 1930. January 5, 1931. Negligence — Automobiles — Guest — Joint enterprise — Parties — Imputed negligence — Care required — Death — Presumption — Rebuttal — Incontrovertible physical facts — Joining in hazard — Duty to warn or protest — Contributory negligence. […]