I had an old internet friend on Tumblr when I was 13-14 or so who had the username “coolpng”. One day they just deleted all of their accounts with no warning, no trace, no nothing – just vanished, so I made the username “cooljpeg” in honor of them and in hopes that maybe they’ll run into my e-presence one day. It’s also just a simple 'n funny username, and I love jpegs so :+D