What to do if a Tory or Lib Dem approaches your home

When they come canvassing, talk to them.
Talk to them for ages.
Tell them not to walk away as you tell them what you think of them because you're being reasonable.
Tell them every second they spend with you is less time they'll spend with the less reasonable people further down the road who simply want to kill them for what they've done to this country. Wish them luck.
You do not have to mean it.