'Running out of'

Amber: Hey, Leo, we're running out of cereal, and carrots!
Carlo: Okay Lovely, I'll call the butler and have him go and pick some up. (He He)

• Notice, Lovely, that after 'running out of', the cereal is a mass noun (generally a non-countable noun), like ketchup, or mustard, or;
• it is a plural, countable noun, like carrots, or peanuts.
• We don't say 'I'm running out of pea', or 'I'm running out of times.' And;
• we generally don't say, 'I'm running out of coffees.', or bean, but;
• since the age of fast food began, we sometiems do say 'coffees', or 'ketchup s', because;
• they are sometimes self-contained in a special cup or package, as one unit.

Examples:

The company was running out of party hats but had plenty of paper to make new ones. John, in accounting, who never runs out of ideas, thought of using painting last years hats for the party, so that saved us some time, which were were running out of too.