The vendor who announced after our offer was accepted and after the survey had been done that they would not exchange contracts until the end of the academic year. This was back in November 1990 but I have always remembered it. They really did expect us to wait 8 months and were shocked when we didn't.
The house where you could not live for 2 or 3 months every year because the spring water supply dried up in dry weather. Luckily they told us this during the tour.
The house that neither us nor the Agent could find when we went for a viewing. We followed the instructions to the letter but there was no "secluded cottage" in sight when we arrived at the crossroads. We didn't find it using revised instructions either!
The house where the Estate Agents particulars didn't include a single picture of the inside of the house. When we looked inside we realised why!
The house in a valley that didn't get any direct sun from late Nov to late Jan due to high hills surrounding it on three side.