If there's one piece of camera gear I spend the most time talking to people about, it would have to be this: my Jacobson Sound Blimp.

When I'm talking to clients about it, it's my 'silencer' - which lets me photograph in near silence during filming, concerts, operas, and theatre performances with an audience.  When people do (occasionally) spot me during these kinds of shoots, mostly they imagine it's a giant old film camera, and wonder why I'm not into digital like all the kids are today!