It all depends on the situation, time and place, audience, their mood and how open they are about being shown magic. You have to avoid taking yourself too seriously, involve everyone, and remember even if you do the same routines over and over again it will never be exactly the same each time, because everyone reacts differently.
If you perform at enough restaurants and for enough people in general, you'll run into those who are less than um..."sober", and this makes for a very interesting time. Sometimes people get touchy feely with your props, you'll have to learn to light heartedly correct this behavior without sounding like you are berating them.
And be ready to answer the same silly questions over and over again, like "Hey, can you make a Rabbit appear?" It's that question that made me start carrying sponge bunnies in my pocket. I get the question, I place my deck of cards in the pocket while palming the bunny, reach into my shirt pocket (or hat if I am wearing one), produce the bunny, give it to the spectator who asked (always pink bunnies...because usually it's guys who ask and when you produce the pink bunny and hand it to them with a playful..."That'll teach ya", it gives you a warm feeling that they now have to hold a pink bunny like a dork for the remainder of your act.) you get a cheap laugh...and move right along.
- Steve