So, this topic got me thinking back to some real clunkers. I remember this one customer brought in a late-90s compact that was just soul-crushingly slow. Merging onto the highway felt like a life-or-death negotiation. But honestly, I think the true “worst” experiences come from the project cars that are more hazard than hot rod. I worked on a '78 Firebird once where someone had “upgraded” the brakes with mismatched parts from three different vehicles. The pedal went straight to the floor on the first test drive talk about a heart-stopper. What about you all? Do you find the gutless daily drivers more frustrating, or does a dangerously botched modification take the crown for being the absolute worst?