I, too, have never been asked to do anything objectionable. There was once a sometime regular errand I would run for an old boss, but I was always at liberty to say no. This task was to pick up lunch for him - only on extraordinary days when he could not get away. Always the same place, always the same order. I would have done it anyway, but he always gave me a $20 bill and told me to get lunch for myself for the trouble. When I first started and didn't get myself lunch the first few times, he would actually bring in some snack or candy the following day. I figured out eventually that it would save him the trouble of bringing something in if I would just get myself lunch, so I did. That made him happy. :-)
DonnaP99