There's a difference between being cheap and being frugal.

When the school principal is the first person to deny funding for any extra projects but also the first in line to reap the benefits, teachers can get a little fiery in the teacher's lounge.

Usually good Samaritan behavior is something people don't expect reimbursement for, but apparently for one woman, her mother-in-law expected to be paid in full for her good deeds.