Oh My God.
I had 1100 pieces of candy. I started out giving out 3 per kid, figuring on 300+ kids.
7:00 - realized I was running out, and switched to 2 per kid.
7:30 - realized I was really running out, and switched to 1 per kid.
7:40 - ran into the house and found a small stash of dove miniatures plus a few bags of potato chips and teddy grahams.
7:57 - ran into the house to hide.
Doing the math, I had well over 400 kids come to my house tonight. And that's before I ran out. The only thing that made me feel a little better is that my neighbors on either side ran out almost exactly when I did.
Update: Talked to a neighbor. He says they had enough for 500 kids, and they ran out when I did.