Intent in magic

[Catlady (Rita Prince Winston)]

Snow wrote in http://groups.yahoo.com/group/the_ol
d_crowd/message/3192 :

<< You must say the incantation correctly to produce the effect;
Wingardium Leviosa >>

Or say it incorrectly to produce the wrong effect: "never forget
Wizard Baruffio, who said 's' instead of 'f' and found himself on the
floor with a buffalo on his chest."