Open your Mac Terminal and run the following commands.
Hint: you can run the commands by copying and pasting them into your terminal, then hitting the Enter/Return key.
ruby -e 'C=`stty size`.scan(/\d+/)[1].to_i;S=["2743".to_i(16)].pack("U*");a={};puts "\033[2J";loop{a[rand(C)]=0;a.each{|x,o|;a[x]+=1;print "\033[#{o};#{x}H \033[#{a[x]};#{x}H#{S} \033[0;0H"};$stdout.flush;sleep 0.1}'
say 'Hello Brooklyn!'
say -v ?
say -v "Zosia" "Lalalalalalalalala" -o recording.mp4`
open recording.mp4
for voice in `say -v ?|cut -d" " -f 1`; do echo $voice; say -v $voice 'hamburgers'; done;