I have also artificially induced an Ugh Field in myself. A few months ago, I was having a horrible problem with websurfing procrastination. I started using Firefox for browsing and LeechBlock to limit (but not eliminate) my opportunities for websurfing instead of doing work. I'm on a Windows box, and for the first three days I disabled IE, but doing so caused knock-on effects, so I had to re-enable it. However, I knew that resorting to IE to surf would simply recreate my procrastination problem, so... I just didn't. Now, when the thought occurs to me to do so, it auto-squelches.