Neighbor, who lived next door to Homeowner, went into Homeowner's garage without permission and borrowed Homeowner's chain saw. Neighbor used the saw to clear broken branches from the trees on Neighbor's own property. After he had finished, Neighbor noticed several broken branches on Homeowner's trees that were in danger of falling on Homeowner's roof. While Neighbor was cutting Homeowner's branches, the saw broke. In a suit for conversion by Homeowner against Neighbor, will Homeowner recover? 
Yes, for the actual damage to the saw.  Yes, for the value of the saw before Neighbor borrowed it.  No, because when the saw broke Neighbor was using it to benefit Homeowner.  No, because Neighbor did not intend to keep the saw.