I dont wish to insult anyone but the simple truth is if this things does happend, your not good enough. You have to think about, what is wrong with my performance and with my magic, not what is wrong with youtube.
The secret is nothing, i have seen some "masters" at work fooling me and everyone around with methods everyone knew about but no one could figure it out. Because they were so entertaining and so smooth with their handelings. Its all about presentation and to make your spectators have a great time.
There is a big difference bettwen showing someone a cool trick, and to show people magic and entertainment.
If your showing someone a card trick, no matter how good it is, it can be the greatest card trick in the world without any good presentation and performance, you are not showing them magic and entertainment, you are showing them a puzzle which your not going to tell them how it works and by peoples nature they will want to figure it out. If your showing them magic with a good entertaining presentation, you are showing them magic and entertainment to make them happy and feel good, thats the goal of magic not to fool people, and they will not care about the method.
A good example of a guy who was a master at routining and presentation was Tommy Wonder even if he uses the most basic sleights you will still get fooled because hes presentation is so great.
Watch his coins across here. It uses the most basic coin sleights, just read the first pages of bobos modern coin magic and you got it but you will still get fooled.
http://www.youtube.com/watch?v=AdjEphrI43s