Oh, yes, the old forgot-the-loudspeakers problem...

And I also know the "Hmmm, where does this strange ringing come from? I never heard that on this cd, before?"-phenomenon. Proper inspection of the equipment usually isn't necessary, though, because after my taking the phones off the culprit usually turns out to be the alarm clock. <sigh> But my craziest headphones experience is quite recent. I found that I can equalize and zoom sound and even do a kind of crossfeed with different levels in my head. It still only works under certain conditions, and I really have to concentrate - but it's getting easier every time I try to reproduce it. Funny thing...
Greetings from Munich!
Manfred / lini