Roses from nothing
The magician gets on stage, shows his hands completely empty to the audience and suddenly produces a rose out of nothing… he places it inside a hat (or any another box) and again from nothing produces another rose, he places it inside the hat and immediately after he produces another rose and then another one, more and more quickly. At the end he takes his hat with all the roses in it, and overturns it in front of him… There is no trace of the roses!