Just walked back into the house, at the same time my wife arrives after walking the dog. Inside for 5 seconds, when there's a knock at the door. Wife opens door, to be greeted with 'I'm on prison release, don't worry, I'm not dangerous. I need a fiver'. Dog starts barking at him like mad, and my wife not comfortable with his 'approach' said 'I'm really sorry, we've got things going on here at the moment' (partly true, but partly unhappy with his manner. He replied 'no you're not' turned round, and thumped our wall.
We have purchased once before, when someone was pleasant, and was selling something that we (almost) needed.
This guy may have said he wasn't dangerous, but he was threatening in his manner.
For the record, I hid in the kitchen, ready to jump in with a vicious kitchen implement