The classic apprentice prank, done kindly: pick a safe errand, keep it short, make sure the person is in on it by lunchtime, and never involve anything dangerous.

Blinker fluid, muffler bearings, left-handed screwdriver, sky hook and more. The most famous fake parts and prank errands for new apprentices, explained.

Sent to fetch a sky hook? It is a classic workshop prank, and also a surprisingly real idea in engineering. Here is the story, from the apprentice errand to skyhook suspension.

Muffler bearings do not exist. Learn the origin of this classic garage prank, and what really causes a rattling exhaust: hangers, mounts and heat shields.

Blinker fluid is not real, it is the classic garage prank. Here is where the joke comes from and what actually makes a turn signal blink fast, slow or not at all.