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.
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For me this would be the "clever" names I guess
For example Aral has his full lastname with a URL and that's just amazing!
Like ar.al with the username in front so fristname @ lastname or something