I was hoping Therese Alshammar would have had a better Olympics than she did but apparently short course meters pools are her forté.
In this video Alshammar almost nails a WR in the butterfly after coming from behind with a quick thrust towards the wall: [Link]
Here she does set a WR in the butterfly after trailing once again for at least 95% of the race but then snathcing victory at the wall with a great finish: [Link]
She is a very technical swimmer. I wish Glenn Mills or somebody would do a video with her so her work could be studied.