I alla fall skulle caster känna en ...
"...floating sensation as every thought and worry in his head was wiped gently away, leaving nothing but a vague, untraceable happiness" -the goblet of fire
Potentialen för en miscast eller dåligt utförd imperiell förbannelse kan skicka dig till St. Mungos quacking som en anka, som det var fallet med Herbert Chorley.