In some embodiments, audible alerts issued by a portable electronic device can be silenced in response to user smacks on the body of the device. These audible alerts are initiated by applications running on the device, such as email, phone, alarm, and/or timer applications. In some embodiments, the device includes one or more accelerometers that detect and signal the user smacks. In some embodiments, the alert response mode of the device (such as whether it rings or vibrates to signal an alert) can be changed in response to predefined patterns of user smacks.