The person who arrived at the wrong place needs directions before laughter.

Turning up somewhere wrong already carries its own small dread. The person is late, disoriented, aware of having made a mistake in front of people, and the first response they meet decides whether the rest of the day is recoverable. Amusement, even friendly amusement, lands on someone who is not yet steady enough to enjoy it.

Give the practical thing first: where they need to be, how long it takes, whether they still have time. Then, if it is genuinely funny, laugh together once they have somewhere to go. The order costs nothing and it is most of the difference between being helped and being watched.