The key ia to write it all down because 1 in 100 is actually badass and you wont realize it for a while. The next morning everything is shit. 2 weeks later its still shit but at least you didn't delete it all even though its shit. At some point it either is still shit or its badass poetry/insight/etc. and others soak it up. Then all the bs is worth it.
I woke up the next day and in my notebook were three words that looked like they were written by a 4 year old, it said "DO NOT JOIN". I then opened up pro-tools and saw that we had created 4 new "songs" and all 4 of them were titled variations on "Do Not Join". One was called "The Joiners" another, "You must join" etc. The best part is that most of them had no music, just click tracks. One of them had a track with us talking though and its pretty scary. We just kept yelling "Do Not Join" and "You mustn't Join". -Strange. I eventually started working on a song called "The Joiners" but never did anything much with it. I have it demo'd up, maybe I'll post it here. You're right though, you never know if one of your crazy/stupid ideas will spawn something amazing.