QOTD: Which Car Buying Decision Would You Do Over Differently?

Earlier today in my Celica Supra Mark II CC, I lamented about not buying a Supra instead of the Thunderbird Turbo Coupe I impulsively bought in 1983. How about you? With the benefit of hindsight, which one specific car purchase would you do over?

Here is the original post:
QOTD: Which Car Buying Decision Would You Do Over Differently?