This idea is really smart and funny at the same time.
Domino’s in Netherlands use these electric motorcycles for deliveries.
Many people feel electric motorcycles are dangerous because they can hardly hear the engine sound while they approach from behind.
So what was their answer for this problem? They achieved this by using an artificial engine sound to secure safety. Since this idea was too fresh, pedestrians had no choice but to laugh at it. A good promotional effect.
By the way, Domino’s did something really attracting in the past.