Vintner is the owner of a large vineyard and offers balloon rides to visitors who wish to tour the grounds from the air. During one of the rides, Vintner was forced to make a crash landing on his own property. Without Vintner's knowledge or consent, Trespasser had entered the vineyard to camp for a couple of days. Trespasser was injured when he was hit by the basket of the descending balloon. If Trespasser sues Vintner to recover damages for his injuries, will Trespasser prevail? 
No, unless the crash landing was made necessary by negligence on Vintner's part.  No, unless Vintner could have prevented the injury to Trespasser after becoming aware of Trespasser's presence.  Yes, because even a trespasser may recover for injuries caused by an abnormally dangerous activity.  Yes, if the accident occurred at a place which Vintner knew was frequented by intruders.