Do you think about the ringer on your phone and the ability to turn it off? Dan Saffer uses this example to kick off his book Microinteractions. Silencing the ringer on your phone is a common feature. If that feature is clunky or hard to find it interferes with needing to silence it quickly, in a crowded movie theatre for example. These tiny interactions that surround the main functionality are integral to rounding out the entire experience.