For me it was buying a black Astra GTE in the dark and rain. It looked so shiny sat there under the street light luring me in with its sexy twin headlight conversion. Rain hiding the bubbles in the paintwork on the bonnet and roof. Needless to say I had to have it. The list of things wrong with it was insane I used my dads RAC membership to the limit on that thing. Managed to offload it to someone who also loved the twin headlight conversion, so much so that he didn't notice it smoking away on the test drive or the dodgy digital dash, broken seat etc, etc, etc.