Well I put on my Halloween constume (a grim reaper with skull mask) that I use every year to scare the kids at the door.
We had three Yorkies last year and now have five (adopted two from a rescue this year) and they had not seen dad dressed up before.
Wow! I walked in and Zander started barking barking barking....when I walked to him, he just started growling.
Finally I took of the mask and got down on the floor and he warmed back up to me....that is until I put the mask back on.