Today's discovery is that the left earphone in my current set has completely died. The earpiece itself is fine, and I've narrowed it down to a break in the left signal wire (which, since the plug is moulded, would probably cost me in parts as much to repair as a new pair of earphones).
Why must all my earphones break after a year?
Edit: ok, Murphy is definetely mocking me today. The first pair of earphones I hauled out of the dead pile actually work fine.