Buffy: The Vampire Slayer - Not Polite to Enter Uninvited. or Possible for That Matter.
In the episode of BtVS entitled "Angel" where Buffy and Angel are running from the three, they run onto the porch and in the front door of Buffy's house. Buffy turns to slam the door shut and one of the three throws hi hand in the way. The only problem ins that he was never invited so he should never have gotten his hand passed the doorjamb.
copy of buffy season 1 episode "Angel"