What sprinkling humour into UI copy actually does

"Add a little personality to the empty state" is a note I've gotten more than once, usually late in a project, usually as a nice-to-have. I don't think it's a nice-to-have. I think it's load-bearing.

An empty state, an error message, a confirmation toast — these are the moments a product talks to someone directly, without the usual scaffolding of a feature explaining itself. Getting the tone right there does more for how "delightful" a product feels than most visual polish, because it's the moment the user's guard is either up (something broke) or down (nothing to look at yet).

Where it works, and where it doesn't

Humour works when it respects the user's time and state of mind — a dry aside on an empty dashboard, not a joke inside an error that just cost someone their unsaved work. The test I use: would this still read as funny if I were the one hitting this screen at the end of a stressful day? If not, cut it.

Done carefully, it's not decoration. It's a small, repeated signal that a person built this, and that person was paying attention.