HP 2100 computers (Old - 1970's) Easter Eggs

Easter Egg from 1973 on HP 2100 - 7.0/10 with 95 votes
Could this be the "oldest" computer easter egg?

In Hewlette Packard DOS system for their 2100
(later called 1000 series) mini-computers,
entering the console command:
WHY?
would return a response of:
WHY NOT?

This DOS system really... more
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