Pull the tab, open the can of worms

When I was much younger, I did some volunteer work at Stanford Hospital, in their rehab facility. I was working on a collapsible cane project, not directly with the patients, but it was a great eye-opener anyway. That's when I found out what 'they' called 'us': TABs.
As in, the Temporarily Able Bodied.
Now that I'm not, of course, I get it.
Given all the things that befall us (accidents, disease, aging), you'd think that people would not be so cavalier about their condition, nor so prejorative about those who've gone before them to that place where things don't work so well.
But, being human, they don't. They think 'hey, I'm healthy, it can't happen to me'.
As the joke goes, want to know how to make God laugh? Tell Him your plans.
I had plans. Now I have different plans. I'm sure God has had a good laugh at both sets...