The back window of my Hyundai hatchback.

Unfortunately, it's not what you think: the post did not go straight through the glass. The door, without the arm (poor and broken as it was) was better than nothing and the door simply fell and closed so hard that the glass shattered. I'm not kidding! This sort of thing happens in business too where in fixing or replacing something, another thing even more critical breaks. What can you do to avoid this and learn from my moronic mistake?

1. Read the instructions
• Seriously. The people who wrote them did for a reason. I know that something as simple as disconnecting one thing and plugging in another sounds simple enough for a monkey to do, but by skimming the safety measures you might learn a valuable step before it is too late.
2. Have a buddy
• On projects that have a lot of moving parts, it is nice to have someone at the very least watch what you are doing. They can warn you of mistakes before they happen, find that missing piece that you almost forgot about, and give you that third hand when you need it during multitasking situations. If you've ever put together Ikea furniture, you know what I'm talking about.
3. What if's
• Personally, I hate the "what if" game; I think it is negative and unnecessary and unhealthy worrying. However, it can help you be prepared for the worst. Sometimes a quick consideration of what other things can be affected can increase your awareness of your surroundings and one of those "other things" that can get broken as a result of your "fix". Definitely use this technique in moderation though!

Good as new!