Provides a more subtle entrance than
Johnny from The Shining
This method might deflate your illusions of security, and increase your paranoia. But, as many have pointed out, what good would this actually do? Let's say the bad guy is outside the room and he manages to defeat whatever lock you've locked, and now all he has to do is unhook the chain. If the chain is locked, then you must be inside the room. Isn't it possible that with all that mucking around with the door and the rubber band and the chain that you just might notice the bad guy?
So this video about deceptively hacking a hotel chain lock is itself deceptive.
Thanks to Lifehacker's Unlock a Sliding Chain Lock with a Rubber Band>>