0xDEADBEEF and varients are one I always enjoyed. It goes back to the early days of the internet, at least the 80s. It is one of very few phrases you can spell out in hexadecimal.
CleverLibre Social is an inclusive social instance for open discussion, learning, and community.
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This is Mur 
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For example Aral has his full lastname with a URL and that's just amazing! 
cc
@stux @freemo