On January 6, 1995, McArthur Wheeler and Clifton Earl Johnson robbed two Greater Pittsburgh banks at gunpoint without attempts to disguise themselves. Instead, they covered their faces in lemon juice, believing it would make them "invisible" to security cameras. Johnson was arrested a few days later, while Wheeler was caught in April after being identified in surveillance photos. The robberies directly inspired the research of the Dunning–Kruger effect, which explains much of our world today.