A van from Mario's Squibb Company is damaged by a heavy metal keg, which rolls out of the second floor window of the two storied Toss-Co. Flower building. Toss-Co. Flower is the sole occupant of the building. Although the van was parked under the window while making a delivery at the Toss Co. receiving dock, no one admits to having seen the keg fall, nor are there any witnesses who can state where the keg was just before the accident. Can Mario recover against Toss-Co. for negligence?