When I was like 9 or 10 I thought our neighbor was at the door so I jumped out in my home made samurai pizza cats outfit, yelling "samurai pizza cats, they're so bad!", presuming that he was there to play samurai pizza cats.
Turned out to be a boy from my class at school collecting money for something. He proceeded to blackmail me, getting my lunch in exchange for keeping my dorkiness hush-hush.