1. A computer-implemented method comprising: selecting a predetermined voice command which, when spoken by a user during a conversation with another person, informs a wearable computer device that an event is occurring, and that prompts the wearable computer device to store an audio clip surrounding the event in a memory for later retrieval; using audio signals received through an environmental microphone of an audio-only user interface of the wearable computer device to generate digital audio data; buffering the digital audio data in a scrolling audio buffer of the wearable computer device for a predetermined period of time; using audio signals received through a personal microphone of the audio-only user interface of the wearable computer device to determine that the user has spoken the predetermined voice command; and responsive to determining that the user has spoken the predetermined voice command, storing the audio clip in the memory for later retrieval, the audio clip including at least a portion of the digital audio data buffered in the scrolling audio buffer before the predetermined voice command was spoken, and at least a portion of the digital audio data buffered in the scrolling audio buffer after the predetermined voice command was spoken.
1. A computer-implemented method comprising: selecting a predetermined voice command which, when spoken by a user during a conversation with another person, informs a wearable computer device that an event is occurring, and that prompts the wearable computer device to store an audio clip surrounding the event in a memory for later retrieval; using audio signals received through an environmental microphone of an audio-only user interface of the wearable computer device to generate digital audio data; buffering the digital audio data in a scrolling audio buffer of the wearable computer device for a predetermined period of time; using audio signals received through a personal microphone of the audio-only user interface of the wearable computer device to determine that the user has spoken the predetermined voice command; and responsive to determining that the user has spoken the predetermined voice command, storing the audio clip in the memory for later retrieval, the audio clip including at least a portion of the digital audio data buffered in the scrolling audio buffer before the predetermined voice command was spoken, and at least a portion of the digital audio data buffered in the scrolling audio buffer after the predetermined voice command was spoken. 11. The method of claim 1 , wherein selecting the predetermined voice command further comprises: prompting the user to specify, via spoken input: a phrase that will serve as the predetermined voice command, an amount of digital audio data buffered in the scrolling audio buffer before the predetermined voice command is spoken to store in the memory for later retrieval, and an amount of the digital audio data buffered in the scrolling audio buffer after the predetermined voice command is spoken to store in the memory for later retrieval.