Google
Google for Education: Finding Patterns in Spelling Errors and History
For this lesson, students analyze spelling errors and large sets of data to find patterns, develop abstractions, and discover how large amounts of data can tell us much about our society.
University of Canterbury
University of Canterbury: Cs Unplugged: Error Detection
This activity is a magic trick where the demonstrator is "magically" able to figure which one out of dozens of cards has been turned over, using the same methods that computers use to figure out if an error has occurred in data storage.