ec2-18-191-254-0.us-east-2.compute.amazonaws.com | ToothyWiki | RecentChanges | Login | Webcomic The best example would have to be: "This program has performed an illegal operation, and will be terminated"
Well.. it's certainly the most common dialog box most people see ;)
(And is actually a good example. Many different programs call it, though not usually intentionally, and it can be replaced with other more personalised boxes - such as one that has an opton to fire up your debugger.)