I have been asked to do several "horrible" things, but almost all have had some, and many much, educational value. Often, I've seen upper levels pass undesirable procedures or tasks to med students and call it "educational" as a way to avoid doing it themselves.
A few examples:
1) I had a med resident who would see a pt in the ED, order labs and films, and set me to tracking them down. This person would H&P the pt without me. At some point I would be paged with a message to the effect of "ED bed 9 needs Rectal" or if especially gross, "ED bed 12 needs pelvic c wet prep". I wasn't able to H&P every patient our team admitted on a call night (I usually maxed at 4-5), I did all their rectals most of their pelvics. I didn't mind or complain because mastering the rectal and pelvic exam is an absolute necessity if you plan to be a good doc.
2) Disempactions... I can remember my first and only. Our team was busy and a really nice lady was in severe pain and I noted "Hard stool in vault" on her rectal exam. "So you want procedures...", my attending said, as he delegated the disempaction to me. He stopped by every 3 minutes, popped his head in, and made joking comments such as "you ok in there?", "haven't fallen in, have you?", etc. It was all in good humor and the pt was knocked out, so I really didn't mind. It was the grossest thing I'd ever done, but disempaction is a skill every doctor needs to know, even if he/she has nurses or med students to delegate to. Also, the lady was so grateful when she woke that it almost made it worth being up to my elbows in her..., uh you get the idea 🙂.
3) The only scut experience I've had that really hacked me off was when a surg chief interrupted me in the middle of my interview with a really interesting clinic patient and sent me to get sodas for him and the nurses. I don't mind scut tasks like getting food because it really helps the team when you're busy because the student is often the only team member who can leave the hospital. It really is malignant scut if you miss out on educational activities to do some task that is of no educational value and serves little purpose other than allow the chief to show off in front of a cute nurse.
FWIW