I would argue that Halley's comment only comes ONCE every 75 years and yet everyone knows when it shows up. Halley's clearly has a 'tale" every time it appears and anyone who writes 'tales' on this site is exempt from comments. If I only showed up once every 75 years and left a 'tale' every time then would I be a sloth, I don't think so. Having only shown up once since the site started and having left a 'tale' for everyone to see, that is certainly no sloth.