Final answer:
The last part of a safety demo is usually instructions on the bracing position, which teaches passengers how to protect themselves in case of an emergency landing or crash.
Step-by-step explanation:
The last thing typically presented in a safety demo, such as the one conducted on an airplane before takeoff, is the instruction on the bracing position. Passengers learn how to protect themselves in case of an unexpected landing or crash. The demonstration includes how to bend forward, with your head down, rest your chest on your thighs, and your feet flat on the floor. It may also include a reminder to review the safety information card for more detailed information on emergency exits and equipment. The bracing position is crucial because it helps to minimize the force of impact and protect passengers from injury.