Who would...

Who would give up prime time hours on a Saturday morning to sweat and sweat and work and work hard on a project that was not even theirs? Eight people showed... One family of 4 -- the youngest being 10, one family of three, and one man. This goup worked for nearly 2.5 hours ... picking up trash, sticks, cutting tree limbs (loaded 2 truck loads and 1 trailer of debris to take to the dump) and mowed the yard twice because the grass was over 12 inches long in lots of spots!

Who would do such a thing in our world? And WHY?