Dirty Jobs Recap: Bug Breeder
Tree Trimmer/Stump Grinder. If you've never seen a tree removed, it's very interesting to watch (although perhaps not by sitting and watching, but checking in from time-to-time). In fact, this is actually a two-part job, the first of which is to cut down the tree itself. Once you get the top most portion removed, you move down the tree a bit, and chop off another section, and then you repeat. All the way to the ground.
There are two main problems here, the first being that someone has to climb all the way up the tree, and while you do you take a chainsaw with you so that you can do the cutting. Maybe you don't have to take a chainsaw, but if you don't, you'll be sawing by hand, and then it takes a whole lot longer, so it just makes sense to take a chainsaw with you. But whichever route you choose, it's a big job.