Q&A: Making indi movie and want to add a certain effect?

Question by Liam N: Making indi movie and want to add a certain effect?
I am making a movie about first year experiences in university, and want to put in this effect; a miter saw that can slide back and forth is in the back position and is in on a small incline, and a kid turns a knob by accident and it slides down whacks him in the face. I need advice on camera tricks and editing and such that will make it look the most realistic.

Thanks!

Best answer:

Answer by Future director
Use an optical illusion. Use a shadow of him getting hit. And plenty of realistic sound effects which are easy to make.

Hint: The less we see, the more believable it is.

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