(Image credit: Lotus496)
Something is wrong with your car, so you take it to a mechanic because they will understand what is going on under the hood. Then the pro opens that hood and laughs. Then takes a picture. It happens more often than you'd think, because there's an entire universe of weird things that can cause automotive trouble.
(Image credit: m4rkz0r)
This list also contains pictures that don't explain your engine trouble, but are odd enough that they felt the need to take a picture for proof. See 50 such pictures at Bored Panda.