Recently on a production I was asked to wear a coms headset.  My favorite headphones are quite large and I rest the boom pole on the top of my head very often while recording and having a second headset on would make that quite uncomfortable and difficult.  Using only what production equipment was on hand that day, I came up with this solution:

Obviously there are better ways to do this, but when you're in a pinch and it has to happen, you do the best you can with what you have.

My RME Fireface 800 audio interface died!  One day it's fine, the next... no lights... no sound... nuthin...  Fortunately, this problem is fairly well documented on ye ol internetz.  (This video on the topic is pretty great.)  Apparently the electrolytic capacitors in the power supply dry out over time (as they do in most electronics).  

Once all the new caps were in power was restored and peace and justice returned to the universe!  Who knows, with better capacitors than it's power supply had when it was new, maybe it will even sound a smidge better too.  Below you can see it happily reunited with it's tribe of misfit gear; the Furman that I put a new front power socket in, the Symetrix 528E who's input I repaired, and the PC cobbled together from parts, and even the power cable that nobody wanted because of a scratch in the middle of it that I turned into two good power cables.