I once playtested a Middle Earth (pen-n-paper) tournament scenario set in ME during the events written up in LotR.
We were playing two hobbits who came across an account that led them to believe that there was wild pipeweed growing on the eastern slopes of Weathertop. Having recently been stiffed in the purchase of a pipeweed farm in the southfarthing which turned out to be blighted, we went to Bree, hired some help (the other PCs) and headed off with wagons to harvest the weed and try to make a quick profit.
We'd just finished harvesting the stuff when that nice firework-maker Gandalf came along the road. He seemed rather upset with us being so far from the shire, and told us to abandon our wagon of pipeweed and go cross-country without using the road to (some town north of Bree), because it was dangerous for hobbits to be seen travelling in this part of the world at the moment.
Then he thought again and asked us if we'd take this rather nice ring with a red stone with us when we went cross-country, and to bury it somewhere to the north before going to the town. We agreed.
When we stopped for the night, we saw some sort of lightning storm during the night back south at Weathertop. It was rather odd, since the weather was clear where we were.
We then spent a few days fleeing across country being hunted down by four Nazgul and killed. That's why there were only five Nazgul at Weathertop when Aragorn and co. got there.
It was cool. Fun to play around the edges of a well-known story. We also enjoyed outselves trying to "unwittingly" bring as much grief down on ourselves as possible (by chosing to go under the pseudonym of "Baggins" when in Bree, for instance

)