Replying to ACL tears are weird...

So about a month and a half ago I was skiing at Copper and overshot one of the jumps causing me to fall from about 30 feet in the air to flat. When I hit my right leg wouldn't move at all for about 30 seconds but then I was able to pull myself up and ski down on one ski. Anyways I had x-rays done and nothing was really told from that besides the fact i didn't break any bones. So I took some crutches and used them for about 2 days and then began walking on it again and for the past month i've been walking on it fine, it felt slightly unstable at times and certain motions of my knee would cause some pain but I figured it was just strained still. I went and had an MRI done on it last week though and got a call yesterday from the doc telling me my ACL was completely torn and now I get to have reconstructive surgery in a few weeks. Has anyone else had this happen where you were totally unaware of you're knee being fucked? I just didn't think that was possible to have a torn ACL and still have nearly normal movement of it all.