I have 2 good examples:

1) There is 2000 acres of agrilulture across the road from the land I hunt. The land I hunt on is about 3000 acres of wodds and fields when you throw in the neighbors. Along the east side of this on the road, there is a strip of houses, a couple woodlines by a church and some more houses and a nursery. The deer have to pick a spot to cross the road to get to the ag fields. They pick the woodlines on either side of the church. This is the best cover and has the least human traffic. So all the deer at the top of the hill in the woods funnel down to this small area.

2)I don't know if this is considered an actual funnel but at the top side of a hollow, there is a bench that crosses it usually. This is an easier spot to cross than crossing down the sides of the hollow and up the other side. The deer take the bench to get to the other side.