Mainly it snows, but sometimes it rains knives…

precip.bash

#!/bin/bash

case $((RANDOM % 4)) in
  1) precip=🔪 ;;
  *) precip=❄️ ;;
esac

lines=$(tput lines)
columns=$(tput cols)

for ((i=0; j=--i;)) do
  clear
  for ((d=lines; s=++j**3%columns,--d;)) do
    printf %*s$precip\\n $s
  done
  sleep .1
done

This is an update to Jerry Gamblin's script for macOS.