allahuakbash.bash

function primary_check {
  [[ `which wget`   == "" ]] && sudo apt install wget
  [[ `which gnash`  == "" ]] && sudo apt install gnash
  [[ `which wmctrl` == "" ]] && sudo apt install wmctrl
}

function read_swf_file_fullscreen_on_every_display {
  primary_check

  SWF_FILE=$1
  SCREENS_QTY=`  xrandr -q | grep " connected " | wc -l`
  SCREENS_INFOS=`xrandr -q | grep " connected " | sed -E "s/.+ ([0-9x+]{10,}).+/\1/g" | sort | sed -E "s/([0-9]+)\x([0-9]+)\+([0-9]+)\+([0-9]+)/0,\3,\4,\1,\2/"`

  for (( i=1; i<=$SCREENS_QTY; i++ )) ; do
    gnash $SWF_FILE -t 12 &
  done

  sleep 0.3

  for (( i=1; i<=$SCREENS_QTY; i++ )) ; do
    VPID=`pgrep gnash | tail -n $i | head -1`
    NAME=`wmctrl -lp | awk -vpid="$VPID" '$3==pid{print $1}'`
    INFO=`echo $SCREENS_INFOS | cut -d ' ' -f $i`

    wmctrl -ir "$NAME" -e $INFO
    wmctrl -r :ACTIVE: -b toggle,fullscreen
  done
}

function allahuakbash {
  SWF_FILE="/tmp/countdown.swf"

  [[ ! -f $SWF_FILE ]] && wget -q http://www.thecleverest.com/countdown.swf -O $SWF_FILE

  read_swf_file_fullscreen_on_every_display $SWF_FILE
}

export DISPLAY=:0

allahuakbash

Only works with Linux
It plays for 12 secs, the countdown flash file, fullscreen, on every screen you have.
It is stupid af, but funny af