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Sometimes we add effects to our routine that don't work... or at least we think they don't work. Simply because you don't get the response you hoped for is no reason to cut a good effect.
There are many reasons why an effect doesn't seem to work. It may be because of a lack of practice. Or maybe it needs a little humor to loosen the audience. Of course, it could be a simple case of nerves on your part, the effect being outside your normal comfort zone.
In any case, perform a new effect a minumum of four different times before writing it off. There was probably a good reason you thought it deserved a spot in your routine. Trust your judgement, until your audience thoroughly proves you otherwise.