Fearing he was about to be taken apart limb by limb the desperate "victim" dashed to the phone to alert officers of the impending bloodbath. But police who raced to the address in Atwater Close, Lincoln, last night arrived to find the chainsaw-wielding offender gone.
It later transpired that the menacing character waving the 3ft-long power tool had in fact got the wrong address for a fancy dress party.
Police said he had been intent on making a dramatic entrance to the soiree and was dressed as hell-raising rap star Eminem.
Upon realising his mistake he skulked off into the night, chainsaw in tow.
A Lincolnshire Police spokesman said: "The poor occupant was clearly frightened out of his skin.
"The guy turned up at the door with the chainsaw running and must have looked terrifying.
"Luckily he had simply gone to the wrong door. It must have been rather embarrassing for him."