There is a group of flies belonging to the family Dolichopodidae, which are fairly common around here. The common name is long-legged flies, and you can find them on leaves of trees and shrubs, often on top of the leaf and approximately in the middle. Here is an example of one:
There seem to be several common species, all brightly colored and all would make great photographs. Except they are very difficult to photograph. Here is what I usually get instead:
This, or, more often than not, this:
Many times I don’t even get the shadow.
Most insects I photograph are not particularly sensitive to flash. Some will be startled, and in those cases I usually at least get a blurry photo. But not these.
I suspect, but do not know, that the fly is reacting to the mirror on my camera snapping up, and not to the flash itself.
But maybe the one photo out of ten that actually shows the fly will be worth keeping.