body: Am I less responsible/liable for stuff that I break while doing someone a favor, and neither doing anything intentional to cause the break nor being negligent?
  
  
  For example:
  
  
  * someone on the street asks you to take a picture of them with their phone. You drop the phone and cause a visible damage.
  * some friend asks you to drive his car since he's intoxicated. You haven't drunk and his home is near yours. In the way home you crash the car by being slightly inattentive and wrongly calculating the braking distance.
  
  
  
title: Breaking stuff while doing someone a favor