No, I'm not a field tech. I'm a hacker. I work where I am and when I'm in the mood. In a pavilon at the park and idea strikes? Hack! At home and my internet goes out? No Problem!
Edit: All you have to do it jot down the idea if your worried you'll forget about it. You don't have to hand write out all the code that would be silly. I find having a small notebook with me is pretty handy.
http://shop.moleskine.com/FileLibrary/4be794eb3e094e59ac8a8f...