" That's what you people never understand," said Rincewind, wearily. " You think magic is just something you can pick up and use like a, a -" " Parsnip?" said Nijel." Wine Bottle?" said the Seriph." Something like that," said Rincewind cautiously, but rallied somewhat and went on, " But the truth is, is -" " Not like that?" " More like a wine bottle?" said the Seriph hopefully." Magic uses people," said Rincewind hurriedly. " It affects you as much as you affect it, sort of thing. You can't mess around with magical things without it affecting you. I just thought I'd better warn you." " Like a wine bottle," said Creosote, " that -" " - drinks you back," said Rincewind. "