Place a fog machine inside the body of the large display dragon and attach a flexible hose around the nozzle of the device using duct tape.
Attach the timer remote with an extended cord to the fog machine and stretch the remote under the dragon to an accessible area.
Stretch the other end of the flexible hose to the mouth section of the dragon and secure it to the bottom of the mouth with duct tape. Ensure that the hose cannot be seen for full effect.
Follow the manufacturer's instructions regarding the time necessary to warm up the fog machine. When the fog machine is ready, press the button to make fog come from the dragon's mouth.