I wish I had a penny for every time I've ended up doing that :)
I think the worst time was when my sister's boss found out somehow that I worked in support - he used to get her to phone me saying she had problems with her home PC. It started off with simple stuff like setting up printers, installing sw etc but it ended up with trying to get me to talk them through setting up Access db's and similar stuff, always with her on speakerphone and this guy rabbiting away in the background - in the end I got her to put him on the phone and told him my hourly rate - strangely enough I never got another call from him :) and I could go back to not dreading my sister's calls
But today you took me walking, Through a land that we have lost,
While our children sit at websites, With no access to the cost