To take care of your children's children in a way that makes non-grandparents feel undervalued and moronic. Also, to so facetiously do your kids a favour, by simply "babysitting", but feeling like you deserve a hero cookie for it.

When as a grandparent you believe all time spent with grandchildren is needed and required instead of want to or desired by ones self. A higher level of "babysitting " your grandkids!