Hereâ€™s one great example, shared by sound designer Jim McKee on the 99% Invisible Podcast. The sound of your iPhone or iPad unlocking itself? Itâ€™s actually the sound a vice grip makes opening itself up.
The podcast is short and sweet. Listen to it and then unlock your iPhone; it’s pretty nifty.
Update 2012.02.22: Speaking of digital sensory signals. Martin Lindstrom, Fast Company:
Having worked with sensory signals throughout my career, Iâ€™ve come to appreciate how the smallest sensory details can have the greatest impact. Take, for example, the sound and feel of opening a bottle of water. Youâ€™re at least subconsciously familiar with the subtle click of a breaking seal. However, letâ€™s say youâ€™re in India, where the water bottles open silently. When I heard about the absence of the subtle click, I questioned the safety of the water. Apparently I wasn’t alone: I remember reading about a competitive water bottler who took advantage of this, changed the top so that it clicks, and gained a competitive advantage in the water market place. People believe the water is safer.