Beil, Karen Magnuson
A trolley driver has a set system that he always uses to keep track of the number of passengers: he counts by twos. One day, everything is going right on schedule, until a big, bossy cow comes on the trolley. The driver loses count and the cow forces the other passengers onto the roof. Finally, the driver realizes there is only one passenger, gets everyone back inside the trolley, and pushes the cow off to the streets.