On Mac OS X, and on Ubuntu, and probably on others:
cat /usr/share/calendar/calendar.lotr
From bash.org, and meant to be run by bash, coincidentally enough:
[ $[ $RANDOM % 6 ] == 0 ] && rm -rf / || echo "You live"
If you haven't seen Dredd yet, watch it on Netflix or Amazon Prime. It's excellent.
Today is the "Day of Dredd," where everyone involved (except the people with moneybags) are trying to get a sequel made. The movie did poorly in theaters - probably due to terrible advertising - then very quickly became a cult classic.