I visited a Marks & Spencer cafe with my elderly aunt at the weekend. The place was packed and one member of staff was going around with a trolley clearing tables.
One customer (I'm not sure if she was a friend of the staff member) decided to engage her in conversation for about ten minutes (no exaggeration), while customers waited and waited at dirty tables an eventually began to clear the tables themselves.
Myself and my aunt were sitting at a table with a huge amount of dirty crockery, because it was the only table available. After waiting ages, and because there was too much to clear away ourselves, I eventually went up to the staff member and, after saying 'excuse me' three times, she eventually turned around.
I said that there was a lot of dirty dishes on our table that needed clearing. She just replied 'okay I'll be there in a minute' and I said 'thanks' and began to walk away. Whereupon the customer who had been holding her up shouted indignantly 'excuse me, excuse me, we're talking' and seemed outraged that I had interrupted them.
I just said 'yes, and I'm just asking for our table to be cleared' and walked away.
WIBU to have interrupted them? I don't think so as we, along with loads of other people, had been waiting for ages while they chatted away.