Harry Potter remembering his first broomstick ride was not happy enough for him to cast WHAT SPELL? (edited at 8:26 am, January 12, 2017 (PST))
Original question: Harry Potter remembering his first Snitch catch was not happy enough for him to cast WHAT SPELL?
Expecto Patronum (Patronus Charm) [Tigran PETROSIAN] (edited at 1:29 pm, January 13, 2017 (PST))
Original Answer: Expecto Patronum [Tigran PETROSIAN]