Killjoy is the main villain of the slasher-movie "Killjoy" and its sequel "Killjoy 2: Deliver Us From Evil", and "Killjoy 3 (2010)" he is a killer clown that is the end result of black magic on behalf of a tragic individual who sought love but instead became a victim of gangland violence.
Thus Killjoy was born and began to murder everyone he came across, prone to driving an ice-cream truck.