Discovered this today while hanging a curtain rod.
I am using the zircon one step stud finder, seen here http://m.acehardware.com//product/index.jsp?productId=1298011&KPID=997266&cid=CAPLA:G:Shopping_-Measuring_Tools/Marking_Tools-_New&pla=pla_997266&k_clickid=21a0e1ae-1f94-44cd-b27e-a6a83ba1fdc1
Begin by using the stud finder to locate a stud as normal. Release the button.
Lift the stud finder off the wall slightly and press the button. This will help calibrate the stud finder to "empty space", making it think that any hard surface is a stud.
Quickly place the stud finder on your chest, onto your breastbone, the stud finder should beep indicating it is on a stud.
Make joke as normal
This saves you from making the beep noise yourself, which, in my opinion weakens the joke.
This way the tool itself confirms that you're a stud.