This picture shows the hilarious prank that caused a car’s mysterious whistling sound

Redditor JimmysJohn has shared a screenshot of a photo posted by a mechanic of a funny repair they needed to carry out after a customer complained of a strange whistling noise.

Somebody had fastened a harmonica into the engine compartment, causing the whistling noise. The mechanic commented “Customer complaining of a whistling sound from engine …they have definitely got some asshole friends.

Source: JimmysJohn on Reddit