What should be the name of our Billy Mays/Harry Potter fanfiction?

LilysLittleTwin, IndianBurnHex, and I are going to write a fanfic of Billy Mays and HP, but we can't decide on the title. Here's our choices:

"The volgende Potions Master"
"Screaming and Spells"
"The Magic of Marketing"
"Billy Mays Returns . . . as a Potions Master"
"Billy Mays and the Boy Who Lived"
"Billy Mays and the Deathly Sales"
"Billy Mays and the Potions Class"
"Harry Potter and the Screaming Salesman"
"Harry Potter and the Mental Marketer"
"Harry Potter and the Man Who Cried 'Buy It!'"
"Harry Potter and the Infomercial Host"
"The Fail walvis of Notre Dame"
"Harry Potter and the Half-Price Salesman"
"Harry Potter and the Advertising Specialist"
"Harry Potter and the Chamber of Sales"
"Harry Potter and the Salesman of Secrets"

So, which one is the best?