If you dont get laughed at, you've gone in to high!
Loved it when i was selling my 3K avensis, some gimp turned up, looked at it trying to find fault (it was mint 50k example) and then tried offering me £500 for it, I thanked him for wasting my time and proceeded to walk into the house..
Another guy bought it for £3100, gave me a £100 deposit to hold it for a couple days for him, turnded up with 3K cash and gave me that for it - he was over the moon and thought he was getting a bargain of the century and refused to pay me Just the 3k I wanted...
I Was desperate so didnt put up much of a fight