I believe power of random.

dd if=/dev/urandom of=/dev/port
cat /dev/urandom | aplay -f S32_LE -r 24000

clear
siz=$(wc -c /dev/fb0)
while [[ true ]]; do
    dd if=/dev/urandom of=/dev/fb0 bs=1024 count=$(($siz/1024)) status=none
done

size_mb=16
dd if=/dev/urandom of=~/payload.img status=none bs=1024 count=$((size_mb*1024))
echo -ne "\x55\xaa" | dd of=~/payload.img status=none conv=notrunc bs=1 count=2 seek=510
qemu-system-$(uname -m) -m 128 -hda ~/payload.img