The above quote as you can see is from Nanny McPhee, and it's as follows:
"When you need me but do not want me, then I must stay. When you want me, but no longer need me, then I have to go"
I think this applied very much to my role as a QA Lead, I seem to spend time with teams who need me, more than teams who don't. This isn't a bad thing, I know teams that don't need me will do fine without me, and by helping other teams I help improve them and improve their processes. I recently read a blog by James Bach here and I think this relates to the above, in that I jump (as James says, A Test Jumper) into help teams as and when I can and as and when it's needed, if teams don't necessarily need my help then I will spend less time with them. Every team is different and has different needs and different level of needs.
I've also said the above to an Agile Coach we had who blogs here, I often said to her that she's only around whilst we need her, and unfortunately once we didn't need her, she had to go, no matter how much we wanted her to stay.
Does this apply to your role? Or are you on the receiving end of this? Either way, feel free to comment, or comment if you don't agree! :)