Once I was at a supermarket’s checkout and the cashier rang up the total: $6.66.
She freaked! It was a couple minutes before I calmed her down enough to hand me change for ten bucks.
Some people are so funny about that. I was in a ceramics shop and the customer in front of me had a total of $6.66 - the owner of the shop who was ringing her up took a penny off so it would not be “that” number.