I have this other Potterhead friend, sister, and I had a wizard duel. (Well, witch for my sister and I) So we broke sticks off trees and had a wizard duel. (And we weren't allowed to use Avada Kedavra.)

Friend: *running around* Expelliarmus!

Sister: Crucio!

Me: Sectumsenpra!

We all run around randomly and point out wands at one another.

Me: Inperio!

Sister: Expelliarmus!

Friend: Impedimenta! (Something like that)

Me: IMPERIO!!!

Friend: CRAP! I'VE BEEN HIT!

Me: Kill yourself.

Friend: *points wand at head* Avada Kedavra.

Then there were kids across the street staring at us.

Me: Guys! We've been spotted by Muggles! Run! *points wand at little kids* Obliviate! *runs away*