An A5 for my wedding /honeymoon/ Arizona road trip, but I booked that, so.....
A SLK form ONT for the price of a Corolla? That’s probably the best.
The worst? An Altima, from Midland Texas, Thanksgiving weekend. ClapTrap 60k miles and a .... ton of noise from the undercarriage. I got out and looked and you could tell the thing had been seriously off roaded to oil derricks. Coated with the clay mud, and all the plastic parts hanging down. Someone had tried to tie it up with twine. The next day we found an open mechanic, put it up on a lift, cut all the loose plastic off and made sure the suspension was safe. Paid the guy $50 for the job. My wife asked if we should get a recite to turn in to the rental company. Nope, one does not turn in an expense on an abused car that we cut parts off of.
The best deal? Somehow between Autoslash and customer service hooking us up, we managed to get a brand new Camry for $20 out the door for 2 days at IAH.