My recent oddball piece of Drupal memorabilia, History of Drupal logos got some tremendeous feedback – thanks, guys! – it seems it struck the nostalgia nerve of the community.
If you spend enough time working with Drupal you'll eventually end up needing to migrate data or posts from other platforms into a Drupal site. I have had three separate situations where I needed to accomplish this.
Me: Happiness is a test suite that passes. @philiph: Do you practice test-driven development for your happiness? Me: Why, yes, actually, I do. It gives me a tangible sense of accomplishment and minimizes my mouse-clicking.