But my hands down favorite was a random sentence generator. It would construct standard sentences using arbitrary nouns, verbs, adverbs and adjectives, which were strictly grammatically correct. It would have us in splits.
A modern day update seems to have been provided by the company in the forms of a gentleman who talks in his sleep. What is more interesting is that there seems a thread of coherence to the sentences - but they are nonetheless nonsensical. Gems include:
"The plumbing doesn't help with the cucumbers anymore.""My vision of hell is a lentil casserole."