I discovered this last week when I listened to a gentleman's heart and heart not the "whoosh whoosh" of mitral regurgitation but a little "vrmmm vrmmm" which happened to be aortic stenosis. It sounded like a little motor trying to start up between every S1 and S2 (because we all know that both AS and MR murmurs are systolic).
I was so amazed that I told the on-call doctor (who already knew this amazing fact) and she made me go and listen to everybody with a heart murmur. And I excitedly hurried off to do exactly that because heart murmurs are now amazing.
God help me, I'm becoming a nerd.