Oh, good, you're going to act like a toddler. That's brilliant, becauae my own wasn't enough of a toddler this morning. If you fail at producing a patronus, it will be on you, not anyone else.
Meet me at 6 p.m. in the mess hall. If you work hard at learning how to do it, I'll keep teaching you. Otherwise I'll ask Professor McGonagall or Moody to take over, and you can waste their time instead of mine.