When I was 18, I attended a party in a village outside Worcester. We began the party by having a barbecue in a field. When it got dark, we were invited into the host's parents' house to watch movies.
There were about 15 of us and we had just come from a field which was sligthly damp. Our host did not ask us to remove our shoes, despite the fact that they must have been dirty and had probably picked up dung of some sort.
I cannot bear to think about what the carpet in that house must have looked like the next day.