I briefly worked nights at a warehouse in Liverpool. It caused me to shout at old people - I was sleeping at about 11 AM a few hours after a shift, and had a delivery via Royal Mail. I was woken up by the doorknocking of the postman, but had to quickly get up and get dressed. I ran after him; he was round the corner by the time I caught up with him. On the way an old couple said "You wouldn't have to chase him if you got up in the morning!". I don't know why but I was so livid with them, I stood their giving them a piece of my mind for at least 5 minutes. Never did get an apology.