https://www.youtube.com/watch?v=R8ZcdyuSvGA

High wing / low wing wasn't a factor in this accident. Both pilots saw and were talking to each other before the mid air collision. Sad. 

right up until the time they couldn't see each other anymore and then hit each other.

you are a  moron if you think hiwing lowing was not a factor in this accident.  Blancoirio would not have mentioned it if it was otherwise

The twin was on a straight-in, doing 160 kts or so - more than twice the speed of the C-150. So how could that be a hi-wing/low-wing conflict? Listen to the CTAF recording.  From where the C-150 ended up on the airport property, I believe that he had already on final. I think the C-150 pilot turned around in his seat and looked out the back window and saw the twin coming like a reenactment of Tenerife.  Then he announced that he was going around because the other aircraft was approaching too fast (which he was).  But the twin-Cessna pilot, even though he knew the 150 was there, STILL ran into him! Apparently this was not the first time that the sky-God twin-Cessna pilot made an approach like that.  The C-150 pilot may have been young and naive, not realizing how stupid and arrogant some pilots can be. (If only he read the posts on this board!) If I'm in the traffic pattern and some hotshot nitwit announces that he's on a straight-in, I do something else until I get him positively in sight  There are reasons for the procedures in the AIM. Terrible, tragic accident.

sadly, it's a condition that isn't all that rare