Spin up a fully-functional, disposable instance of Drupal in about a minute. Try out an unfamiliar contrib module without sullying your main dev environment or give back to the community by testing patches with minimal fuss.
Google recently decided to deprecate the YouTube Data API v2, which caused a nasty bug to appear in the YouTube Field module. I was too busy enjoying the Los Angeles sun at DrupalCon to spot the bug myself. The community came to my rescue.
When someone asks, "Can Drupal do that?" the answer is almost always yes. However, when a recent project required that Drupal merge CMS capabilities with Photoshop-like functionality, I began to question if Drupal really was the right solution.