Doctor Acts Like a Jerk
You're asked to interpret a medical appointment. While the Deaf patient is getting undressed, you step into the hall. You hear the nurse and doctor laughing and saying that when they go back into the room, it's going to look like Sea World because the patient looks like Shamu the whale. You don't say anything, but when you back into the room together, you see them look at each other and smirk. The Deaf patient, however, also sees this exchange and asks them what's so funny.
An Interpreter's Perspective:
In this situation, you're off the hook. Just translate the Deaf patient's question. Now they have the ethical dilemma. Do your job and learn from their insensitivity.
A Deaf Consumer's Perspective:
I think it's important for the Deaf client to have atrust relationship with the doctor. If the doctor isn't capable of such a relationship, the client has a right to know. Place the responsibility back on the doctor and say, "The patient would like to know what is so funny."