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I'm going to assume you're talking about a candid camera type setup… the camera is hidden and you have an actor who confronts someone and does something for laughs.
The real trick here is remote sound and synchronizing the sound with the in camera sound/pictures.
Usually a clapper or some other device aids in this but the camera … well any digital camera will work. There are a variety of microphones. Consider the zoom H-1 for this. You can hold it like a regular microphone or even run a concealed lavalier mic to it. It might be worthwhile to have a shotgun microphone on the camera to get as good sound as you can on the camera track.
As far as software, most NLEs would be suitable provided they let you import alternative sound tracks that you can sync to the video. (The NLE is where you do your synch).
You can spend a lot of money for wireless mic system but that means that you camera would have to have an mic-in jack. Consumer and many prosumer cameras only have 1/8-inch jacks when they have them. That poses a real problem if you're running the mic cord any distances as Las Vegas Casino's would like the odds that a wireless system or an unbalanced sound system is going to fail you.
The point is simplier is better and definitely cheaper. … and remember though, always have a backup. (two mics, two cameras) .
Beyond that, it is a matter of creativity.