Wingardium Leviosa.

"Now don't forget that nice wrist movement we've been practicing " squeaked Professor Flitwick, perched on top his pile of books as usual. "Swish and flick, remember, swish and flick. And saying the magic words properly is very important  too - never forget Wizard Baruffio, who said `s` instead of `f` and found himself on the floor with a buffalo on his chest. 

              Excerpt from Harry Potter and the Sorcerer's Stone, J. K. Rowling