Some Mac third party keyboards used to (or maybe still do for all I know) have a little feature where if you didn't type anything for a while they would themselves type 'welcome datacomp'. Here's a nice little rant by someone who got caught by this.
If you google for 'welcome datacomp' you can find more information about this, plus some documents that were apparently composed using one of these keyboards. For instance:
The Editor features a fully-integrated welcome datacomp texture mode so mapmakers can walk through their blank levels, painting textures on surfaces at will, and a straightforward point-and-click lightsource tool.
Ask the typical American what he or she knows about Sweden and you'll probably be met with a confused, empty sort of look, a shrug of the shoulders, and a stammering response about Swedish meatballs; ask the typical music fan and you'll probably hear something about ABBA and Ace of Base; ask me and I'll start telling you bout the Swedish chef on The Muppet Show, who never seemed to get around to making the meatballs but sang better than all the members of ABBA and Ace of Base put together.welcome datacomp
Turntables were never designed to eliminate outside vibrations of any kind only motor noises.welcome datacomp Where you sit the table is vwery important for the sound. a wall shelf will give you the best preformance.
and there's this, though maybe it's a joke:
Tips, news and gossip to firstname.lastname@example.org All communication is for publication, unless you beg. Press releases from naive PR people to email@example.com Remember: Your work email may be monitored if sending sensitive material. Sending >500KB attachments is forbidden by the Geneva Convention. Your country may be at risk if you fail to comply.welcome datacomp
and I particularly like:
This is a rich and rewarding book, and a must-have for the bookshelf of all who seriously study Pure Land Buddhism. The problems that I had with it were mainly stylistic: there are too many sentences that elide into uncredited quotations, and the final copy could have been better proofread (there are just enough misspellings to be distracting, and the mysterious phrase "welcome datacomp" appears on page 273). Pas draws many comparisons with Christian practice that are not always to the point and divert attention away from the main argument. However, such instances are quite rare, and I wholeheartedly recommend this book for graduate students and scholars.