make a halloween.service in ~/.config/systemd/user/halloween.service

and execute the below commands:

systemctl --user enable halloween.service
systemctl --user start halloween.service

And to enable it on boot and not user login

sudo loginctl enable-linger <user>

and verify that an empty user file exists in: /var/lib/systemd/linger/

halloween.service

[Unit]
Description=Halloween Stuff

[Service]
ExecStart=/home/andrew/scripts/hallo_exec.sh
Restart=always

[Install]
WantedBy=default.target

Also add repeating thunder noise to stop bluetooth speaker auto-disconnect

• Add below to: ~/.config/systemd/user/bluetooth_buzz.service

[Unit]
Description=Bluetooth Buzz to maintain connection

[Service]
ExecStart=/home/andrew/scripts/hallo_bt.sh
Restart=always
RestartSec=90

[Install]
WantedBy=default.target

• And execute below to enable and start on boot:

systemctl --user enable bluetooth_buzz.service
systemctl --user start bluetooth_buzz.service
sudo loginctl enable-linger <user>