A team of specialists is trying to prove that a canvas bought for less than $50 was painted by the iconic artist—and is worth $15 million.

A painting bought for $50 at a garage sale could be a Vincent van Gogh work worth $15 million, according to experts.

This line, famously spoken by the character Stu Macher in the original 1996 “Scream” movie, made a momentous new appearance ...