hi,
i want to tell u that the laws of magic is important to do magic.. 
laws:
1: do not tell the person that what are you doing now in your magic. ya,in such case you have to tell first to force that person to belive in your magic is real then u can tell, but not in another magic tricks..
2:do not do the magic again!if you the same magic they can find the secret!@# if your close friends said to do one more time you can hide their talk to say:sorry, ammmm... ok,i show you another magic.. or another time you can do a silly magic trick and then tell them the secret.
 3: is most important..,do not ever tell the secret that how you do the magic. if u tell them , you loss the fun...