Bill couldn't help but to laugh. "Thank you, but I do know how to do it, you know. Part of the job and all that." He grinned. "Al I said was that I don't generally sprout percentages off the top of my head."
"And how did you ever survive in our family?" he asked with a laugh. "Besides, if you haven't tried it since you were eleven, how do you know you won't love it?"
"A polyjuiced Death Eater who sends garters? It would definitely be an innovation," he said with a smirk. "Shall we make sure she has nothing to drink for an hour?" he asked.