Viktor was an accomplished wizard, but there was one thing he could never quite get. He stood in front of a fake dummy, which had been charmed to look like a Dementor and raised his wand. Thinking a happy thought, he shouted,

"Expecto Patronum!"

A slivery wisp of smoke came out of his wand, disappearing two seconds later. The "Dementor" kept coming. He tried again; concentrating harder. Again, a slivery wisp of smoke came and went. Viktor was getting angry, he stopped and muttered

"I can catch a Snitch, but make a Patronus, no!"

He threw his wand, very annoyed.