This article is from the Stand-up Comedy FAQ, by Steven Rosenthal and Steve Silberberg (firstname.lastname@example.org) with numerous contributions by others.
A. A head shot is a photo of you. You often need to send them to agents and
club owners before an upcoming performance. A goofy headshot will not get
you work. It will still be up at the club in 10 years and will make you
regret wearing those handcuffs and a hula skirt.