Not Normal - Right?

So, a couple days ago I fell down at Meijer. Apparently, their frozen Coke machine was leaking water, and the mat in front of it collected all that water. Despite the 5 "wet floor" signs and the "caution" tape, I was assured by the cashier that it was safe to get a regular vanilla root beer. I got the drink without incident, but as I stepped off the wet mat and onto the waxed floor, I fell onto my knees. I squeezed both the vanilla root beer and the shopping cart handle, so I didn't fall any further. Then I stepped again and fell again. Again, root beer flies everywhere, and my cup gets smashed. My fault for wearing flip-flops, right? No one should grocery shop without non-slip steel toed boots.

Well, since the "incident", my knees hurt terribly, and when I get on my knees for any reason, they make a silent popping noise. Like if I had bubbles on my knees, or a bag of ultra-sound gel (or it is jelly?) or better yet, sound-proof bubble wrap. I don't know if it's bad or not - it just really grosses me out, and I thought you all should be in on this.