I'm wondering how everybody handles a problem I seem to have a lot. I get to work on an idea but while I'm away from it (usually at work), something else comes up and I get caught up in the new idea. The old one falls by the wayside. It's a convenient excuse for not being very productive, but it's kinda frustrating. 
When you're in full-on writing mode, what do you do if a new idea comes along? Do you try and juggle multiple projects, or force yourself to focus on the one you're writing and put the new one aside for later?
When you're in full-on writing mode, what do you do if a new idea comes along? Do you try and juggle multiple projects, or force yourself to focus on the one you're writing and put the new one aside for later?