Harry: Hey guys guys guys! I got just the thing...
Hermione cant draw, Hermione cant draw, Hermione cannot draw
She only reads books and she cannot draw, even if she's reading a 'How to Draw' book 
Lupin: The song isn't even that funny...
Ron: Oh yah!? Lets see you sing song right now, in front of EVERYONE!
Lupin cant sing, Lupin cant sing, Lupin cannot sing
He only reads books and he cannot sing, even if he's reading a 'How to Sing' book 
Lupin: Hey guys! REMEMBER HOW HERMIONE CANT DRAW!?
Hermione cant draw, Hermione cant draw, Hermione cannot draw
She only reads books and she cannot draw, even if she's reading a 'How to Draw' book 