Shake -

Shaking your phone while the app is open captures a screenshot and opens a feedback menu to report issues.

A long-standing accessibility feature where physically shaking the device prompts a pop-up to undo or redo your last action, such as typing or deleting an email. Shaking your phone while the app is open

Popular on Android (especially Motorola "Moto Actions"), this allows you to toggle the flashlight on or off with two quick "chopping" motions. Shaking your phone while the app is open