Wont be it really cool if you could impress your friends with some really simple, classic science tricks that can sell itself very easily as a magic tricks? Whether it is taking the cloth out from under the crockery trick, or the 5 pound note Her Highness happy, Her Highness sad trick, or extinguishing the candles from the invisible, homemade carbon dioxide trick, it will fill your spectators with pure awe and if after that you would want to reveal your secret then thats entirely up to you! Until then keep chanting Abracadabra!
They are classic ones, but always enjoyable. Do it yourself to amaze your friends!