I posted a free design on the forum last week for a hanger that reminds you not to leave your bike on your roof when you enter your garage. @jbmanning5 and @eflyguy brought up a great point regarding not leaving children/babies in the back of your car either. I quickly drew up a design for that as well based on a few images I found on Google. In order to make it easier to find this design, I am separating it into its own post.
Here is what the final part looks like:
Here is the SVG file for you all:
Of course, feel free to customize or improve my design.