Signing off all my emails like this:
Kind regards,
[moooo566] BSc
would probably make me a huge arsehole when all I'm doing is asking someone to come look at a leaky dishwasher, or asking someone if tomorrow morning is okay for the engineer to come look at their leaky dishwasher, but there's one small nagging voice in the back of my head that says I should do it just because I can.