We have a window right next to our front door, and on halloween I like to crouch down below the window wearing a Frandenstein mask, waiting for trick-or-treaters
Then, the moment they ring the bell, I leap to my feet stick my head right close to the glass their eye level and let out a wild roar.
Given it is Halloween, and they ARE doing trick or treat, I think it's pretty funny, .. but sometimes the children burst into tears, (actually they quite often burst into tears) and Mrs Stubborn thinks I am BU.
I always give them sweets though.