I am fan of the Nurse Jackie show. The show has almost nothing to do with nursing - much like MASH had nothing to do with the Korean War, but it's entertaining.
The one thing I always notice is that EVERYONE on the show (EMTs, MDs, nurses) wears their stethoscopes backward. They stick way out from the actor's head every time.
I remember thinking, "I know they have nurse technical advisors, why are they all doing it wrong?"
I realized, well if you aren't used to handling a stethoscope and you weren't actually listening to anything in them...if you put them in correctly, they would blast your ears as you banged them into things.
But if you put them in backwards, the sound is muffled. So I figured the actors were putting them in backwards on purpose.
So use a stethoscope that has the acoustics killed or put the dang thing in in backwards.