I was just waiting for my coffee - there was no-one else in the shop apart from me and the guy that served me - when a homeless man (I'm going to afford myself that my observation was accurate) and started looking at the sandwiches, whilst humming to himself.

After a while he walked over to the specials of the day - looked at them for a few seconds and then walked back over to the first shelf, picked his choice up and casually walked out of the shop, with both me and the shop assistant looking on.