It was locked inside a gated common courtyard shared between 3 tenants. One wall of the courtyard was the back door to a dive bar where they took out the garbage. The landlord owned both the bar and the three rental units. He was only in the courtyard maybe once every couple weeks tops. That didn't stop him from believing the bike never moved. It's ridiculous. that is why is illustrates confirmation bias so well. Because w/ THAT little data he had, he was STILL absolutely convinced he was right