I am sure I am in a minority on this, but I find flies pretty fascinating. I was chasing insects with my camera over the last couple of days, and I came across a couple that are pretty impressive.
This is a tachnid fly in the genus Cylindromyia. Tachnid flies lay eggs on the caterpillars of butterfly or moth larvae, and the maggots develop inside of the caterpillars.
This is a “thick-headed fly,” not yet identified. The group that it belongs to are internal parasites of bees and wasps. Some of this group attack their victims on the wing, and force an egg in between the segments of the abdomen.