..just remembered this topic.

Another good expression is 'habia cuatro gatos'  - there were four cats.
Used when you go somewhere and there was hardly anyone there - i.e. a bar/restaurant with 2 other people. You would say something like:

'La semana pasada fui al restaurante de Paco y habia cuatro gatos'
Last week I went to Pacos restaurant and there were only a couple of people there'