Chameleon colour-changing paint (source)
I saw a car with this as a paint job once and it’s the weirdest thing because you can’t tell what colour it is because it’s different from every angle so I guess if you wanted to have a getaway car this paint job would work for you. Is it blue? Is it green? Is it purple? NO ONE CAN AGREE!
Batman: Well, there are no giant question marks on the car, so it’s probably the Joker.