Let's say for example:
You were experieinced in your field.
For the last two years you had done some work at your child's school, made an impression with the kids,the parents and the staff and given them a damn good expeirence. FOR NO MONEY
A new teacher comes in, and while 'letting' you carry on with this work, she also made it clear that 'we bring you in as we have not got the time' Nothing to do with wanting to give the kids a unique experience, that only a professional, outsider can do!
Would you just want to tell them to take a running jump