People are highly attuned to sensory cues. This means that they are influenced, at an unconscious level, by things they see or hear.
Today’s invention is to equip a pair of boots with a speaker system which is connected to pressure sensors in the soles.
As each foot hits the deck, the corresponding speaker issues a recorded footstep sound. This allows someone to send the subliminal message that they are much heavier than their normal tread would suggest.
I could imagine eg a small security guard in rubber shoes wanting to communicate that he had a massive body supported by hobnailed boots. Or perhaps an actor on stage would want to emphasise a simulated limp or the noise of walking through mud.