Years ago... on a 105 degree Texas July afternoon... a strange vehicle pulls into my yard. Out pops my wife's sister, her 2 kids and my 2 kids. They had left from my place a couple hours earlier to go swimming at the lake.
Sister-in-law says "I got a flat tire a couple miles down the road and don't have a spare. Can you find some way to fix it?"
I go digging through my garage and come up with an old tire on a rim that I figure should fit, throw the sister-in-law in my pick-up(leave all the kids with my wife) and head back to her car.
When we get there, car is on 4 aired-up tires... turns out that the left rear tread had partially come loose and was flopping against the wheel well and sister-in-law determined that it was "flat".
Since we were on a very un-traveled rural road, I had sister-in-law get in her car and "limp" it the couple of miles back to my place. Once there, I opened her trunk to get out her jack and "lo and behold!" there is the original, factory-supplied spare tire in the trunk!!!
When I informed sister-in-law about the spare in her trunk, she replied that she had never learned how to change a flat(30+ years old). I then told her that there was no time like the present for her to learn and proceeded to talk her through the steps of getting out the jack, loosening the lug-nuts, etc.... all the while insisting that if she was ever going to be able to drive that car out of yard, she would have learned how to change a flat tire.
Now, this turned into one very hot, sweaty, over-weight sister-in-law by the time that SHE got that tire changed and she was NOT very pleased with my insistance that SHE was going to be the one to LEARN to change a flat. She just did not seem to appreciate how it may really come in very handly some day....
Guess it may have been partly due to the 105 degree heat. Or, it could have been the part where I pointed out that her father had let her down in the "life-lessons department" by never instructing her on tire-changing when she became of driving age.(Both of my children were required to display to me that they were able to change a flat tire before I would even agree to allowing them go get their driving privileges).
It took sister-in-law a very long time to get over the tire-changing lesson and I believe that to this day, she may not fully appreciate the importance that that "skill" may be to her one day when a tire just absolutely must get changed and nobody is available but her little, 'ol self.
On the bright side, I did not have to attend her birthday party for several years, seems my invitation must have gotten lost in the mail!