Owners of Valve's new Steam Controller have discovered it emits the classic Wilhelm scream when dropped from sufficient height. The Easter egg was first shared online by a Steam user and quickly verified by others. It activates during Steam Big Picture mode.
Steam user RF3D19 posted a video showing the controller releasing the Wilhelm scream, a sound effect first used in the 1951 film Distant Drums. The scream triggers reliably after a drop of about three feet onto a hard surface or cushion, though it may have a cooldown period between activations. The feature requires the controller to be powered on and Steam to be running in Big Picture mode.