A little earlier, 2 people were going to come to my town...1 to sell deliver something I had bought from them at nookbay, the other to pick something up i had sold to them at nookbay.
So the deliverer comes. I won an item for 100 bells from him, but he whined so i was going to give him 500 and a fruit. So i did. I asked him to leave, but he wouldnt...i was going to kick him out, but right then...
The other guy came. He was friendlier. He came over by us...i dropped his arwing, and he dropped his 27,000 bells for me.
i was walking to get the bells, and out of nowhere the other guy came and stole the arwing...
we were in the middle of my town, and he had to cross the bridge to get to the gate...
I starte dto panic, but my brother was watching and he started to yell at me...
So i shut off the game, and the godo guy came back (the other guy was off my list after that), and we had a smooth transaction.
So, i learned a few things:
1)When making a transaction with someon who's not a good friend of yours, always do it in your town, towards the bottom (as far from the gate as possible).
2)Even if you're nice to them (give them a good deal, be friendly), there's still a chance they'll do something like this.
So the deliverer comes. I won an item for 100 bells from him, but he whined so i was going to give him 500 and a fruit. So i did. I asked him to leave, but he wouldnt...i was going to kick him out, but right then...
The other guy came. He was friendlier. He came over by us...i dropped his arwing, and he dropped his 27,000 bells for me.
i was walking to get the bells, and out of nowhere the other guy came and stole the arwing...
we were in the middle of my town, and he had to cross the bridge to get to the gate...
I starte dto panic, but my brother was watching and he started to yell at me...
So i shut off the game, and the godo guy came back (the other guy was off my list after that), and we had a smooth transaction.
So, i learned a few things:
1)When making a transaction with someon who's not a good friend of yours, always do it in your town, towards the bottom (as far from the gate as possible).
2)Even if you're nice to them (give them a good deal, be friendly), there's still a chance they'll do something like this.
Oh well, good quick thinking! 
