So you want that super clever and funny AsciiArtFarts.com humor on your terminal's Message of the Day? Here's how!
First put asciiartfarts-motd.php somewhere where you know where it is:
mv asciiartfarts-motd.php /Users/sam/bin/
Modify your crontab ("crontab -e" on command line) to include something like this:
# motd
0 * * * * php /Users/sam/bin/asciiartfarts-motd.php > /etc/motd.tail 2>/dev/null
Laugh your ass off on the regular
Brought to you by @LoisaidaSam
(I am in no way affiliated with asciiartfarts.com nor does its content represent my opinion on anything)