A couple of years ago when I had just restrung my Dread, and it was sounding bright and chimey, I took it into the bathroom to enjoy a bit of bright reverb. Two things happened : Because I was facing a hard surface, the direct sound from the soundhole bounced back to my ears (we don't usually hear our guitar this way). New strings + true sound inspired me to start playing and singing.
Now here's the thing: I was standing in front of a 3 ft X 3 ft mirror, and spontaneously started playing and singing an original tune and lyric. I seemed to be seeing someone else in the mirror and found it easy to objectively critique what that fella was doing. The disconnect between the player and the image provided a bridge that isn't normally there that felt like an advantage to the songwriting process.
Anybody else experienced any weird and wonderful processes?