Hamlet, Act 4, Scene 3
Hamlet has two moods: the first is "making jokes about wanting to die," and the second is "making jokes about murder."
Here he has killed Polonius, the king’s advisor and the father of Hamlet’s beloved, Ophelia. Hamlet stabbed him through a curtain by accident (you know, as you do) and has officially boarded the crazy boat to crazy island. This might be why he starts joking about Polonius being "at supper" without specifying whose supper it is. (In this case, it’s the worms’ supper. Because Polonius is dead and buried. The worms are eating him. Classic Hamlet.)