My best as a kid were a top 4 places, funny thing I can still tell you who in the neighborhood it was.
1- The pizza place down the street would give away a large slice of cheese pizza on a napkin. Growing up I can from a non pizza oving family (I was the odd ball who could eat it daily) so it was a huge treat for me. I'd even eat some of the napkin getting the extra cheese that melted onto it.

First though we'd hit...
2- A guy who worked for Coke. He'd give us all a bottle of coke in the glass bottles (now I feel old.)
3- A guy who worked for Better Made potato chips would give us all a bag of chips.
4 A family at the end of a dead end road who apparently didn't get many kids (till word spread) and gave away KING size candy bars!!!
Those were the 4 best, if I only got to go to those 4 places I would have been happy.
Worst, well, one of the favorite stores in mmy house is when I was 3 or 4 and someone gave me a box of Dots. Apparently my very well mannered but honest self said "oohhhh, Dots, just what I hate! TAHNK YOU!"

I can only imagine how embarassing that would be now that I am the mom.
Weirdest, nothing stands out, though ther were raisins and stuff, but the weirdest we have here is a neighbor who invites the kids into his garage and acts out a religious play with a bunch of people from his church then the treat he gives the kids is an anti Halloween comic book. We made that mistake once. We skip the house now. I am not anti-religion but we have our own beliefs and our include enjoying Halloween and don't like it being portrayed as evil and feeling trapped in their garage is just creepy.