An example

How can you tell it was a really busy night on third shift?

When a lab tech (namely, me) is standing at the sink with a pile of bloaters at 6am.

How can you tell it was a ridiculously busy night?

When that same lab tech goes home and eats a full meal, despite the bloater nausea.

What I'm really saying here, Internet, is that I am cranky because all I have eaten in the past twenty-four hours is a muffin, a cupcake, a donut and string cheese.