a funny way to kill someone

would be like in a department store (no cameras) at night, lure the victim there and club them out cold with a heavy object nearby (like part of a clothing rack, I don't know, be creative!).  Then, when they're passed out on the floor, unscrew the hands of a mannequin and strangle the victim to death with the mannequin's hands.  Once the victim is no longer breathing, replace the mannequin's hands and position it slightly differently than it had been before, perhaps staring down at the body.  Leave no evidence of yourself.  Enjoy tomorrow's news.