its ok
Don't sweat it man; no matter how clean an effect is or how well you perform it, sometimes, people just don't react. This could be for a number of reasons, but first you have to realize, that that reason isn't you. You will get way more better reactions than poor reactions and that makes it worth it. Who knows, maybe they were really entertained, but just didn't react the way that most people do. Some people react very solemnly and conservatively, but are still just as impressed and entertained as the people that go crazy after an effect. Keep on chuggin man, you picked a great effect, and it's bound to work more than it fails. PM me if you need any help anytime.
Zack