They laughed at an inside joke during dinner.
inside joke
idiomA joke that is understood or meant to be understood only by certain people who are aware of the details (an ingroup).
I felt a bit left out because my friends kept laughing at an inside joke from their trip.
The colleagues shared a knowing glance, their amusement sparked by an inside joke that remained entirely opaque to the rest of the room.
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bad joke
A situation that is badly planned, or illogical.
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half joke
A statement which contains elements of both jest and seriousness.
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take a joke
To accept a joke at one's expense.
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the joke is on someone
Someone is the butt of a joke or is experiencing a negative outcome, especially if that person was trying to make someone else the butt of the joke or subject them to the negative outcome.