Answer:
To: Ranya Herhar (my friend)
Subject: Don't worry, Ranya, I accidentally ate the popcorn.
You know me, I'm always hungry. I know I shouldn't have ate the popcorn, but I was feeling a bit peckish. I'm really sorry. If you want me to, I can buy you some more popcorn.
You left the room, and I was tempted by the popcorn. I just couldn't help myself. So, I think you can figure out the rest. I gave in to the temptation, and enjoyed the scrumptious popcorn.
Ranya, please forgive me, I'll buy you some more popcorn. I promise.