AutoMotoPortal has the list of 5 worst cars ever made - this one is the Peel Trident (1964-1966):
Is it a toy? Is it a spaceship? No, although it looks like it just popped out of the Cartoon Network channel, it is a real car. It was made on the Isle of Man, located between England and Ireland, and was released in 1964. It is not the only one in this class, and surely it was hard to choose the worst one between Trojan 200, Bond Bug, B. M. A. Hazelcar, 1942 Peugeot VLV and many others, but we have chosen Peel as our winner. With it's charming plastic bubble, 183 cm length and 107 cm width, 90 kg weight and an engine which produces 6.5 horsepower and 75 km/h top speed, the Peel is our champion in it's microcar category.