Another fall

I fell again today. That's my second fall in 2 weeks.

The first fall was last week. I was walking down some stairs, and while swinging the stiff leg down to the next step, the socket came off my stump. This left me putting weight on a leg that was not lined up with my stump. Fortunately I was hanging on to a strong banister with my right hand. I quickly grabbed it with my left hand, but I was already most of the way down. I hurt my right elbow. It took lots of twisting strain.
Since then I have gotten a different socket.

Today I walked to get an ice cream cone. As I entered the fast food place, there was a guy eating an ice cream cone, and two families waiting for food they had ordered.  I reached the counter, and was ordering, I had both hands resting lightly on the counter top. 
All of a sudden my face hit the credit card machine, then my chin bounced off the counter, and I fell on my ass. My knee had collapsed, and  as it collapsed, it went forward and hit the counter front, and that made the socket go rear ward about a foot. This unexpectedly pushed me backwards, and I fell on my back, with my head under a table.
I slowly sat up, and started to check if my knee had failed. My sore right elbow was the only thing that felt hurt.
The lady with a small girl grabbed the crying girl and yelled, "Come we are leaving now. Come!" and she dragged the crying child around me and out of the shop.
The guy was still licking his ice cream cone.
I slowly managed to get up, and walked to the counter. The girl behind the counter had not moved. She said "That's 5 rand 50."
The woman of the other family then asked. "Are you OK?" She hadn't moved, in fact none of the family had moved. I said I was OK.
I took my ice cream out side, and worked on my knee. I looked at those people, and thought..."I bet they all go to Church on Sunday."
 I don't know why it collapsed. I am sure I am to blame.