I mean, it happens so often I should almost expect it.
Today Emily and I went to a cafe for coffee with a friend.
We walked through the cafe and to the rear courtyard, where we sat at a table.
There were two other tables that were occupied in the courtyard, and after we sat down both tables had food/drinks brought to them by two different members of the waiting staff.
Ten minutes later we are musing on the likelihood of neither of them having seen us.
I have to temper my opening comments by saying that I have had plenty of good service experiences, otherwise I wouldn't expect good service.
There is nothing more likely to turn you off a particular cafe than bad service, and that includes bad food (although it's a close second).