Discworld - Unseen University Mealtimes
As with the system of bells aboard ship, or the solemn order of prayer services in a monastery, the day at Unseen University appears to be regulated by its mealtimes, which rather like the Bells aboard a ship, seem to occur at two-hourly intervals throughout the day and night.
Mealtimes named in the books so far are:-
Midnight Snack
Somnambulistic Nibbles
Early Breakfast
Second Breakfast
Third Breakfast (discovered by Archchancellor Flacker)
Elevenses
Early Lunch (conjectural)
Second Lunch
Mid-Afternoon Snack
Afternoon Tea - well, Sherry, really
Early Tea
Late Tea (conjectural)
Dinner
Second Dinner
Several of the above are labelled "conjectural" and have been inserted at intelligently guessed intervals with suitable names, to preserve the integrity of a 24 hour cycle in which there are twelve opportunities to eat a full meal. Some of the above may be duplicated entries - the "Afternoon Tea (well, Sherry, really" of Sourcery may well have mutated over the years into the "Mid-Afternoon Snack" of The Science of Discworld III: Darwin's Watch. No evidence has yet been found for the conjectural "Late tea", so if this and one of the Mid-afternoon snacks can be eliminated, we are back to twelve meals again, and not fourteen.
wiki.lspace.org/mediawiki/Unseen_University_Mealtimes