mabel
remember the separate letters spelling RAMBLER on a bar in the front grill? Well, you remove them and reinstall the M, A, B, E, and L in that order. You now have a MABEL instead of a RAMBLER. Took a friend of mine's Mom several weeks before she noticed.
Jim, living in the past again, this was in high school, @1962 or 63.
If you can't think of a response to mabel, use Beep Beep instead. The Playmates (late 50's, early 60's??)