"Thrift, thrift, Horatio..."
See in text (Act I - Scene II)
A subtle and bitter joke, Hamlet comments that the funeral and wedding were so close together that the baked meats from the funeral were served cold at the wedding. The bitterness becomes even more apparent in that thriftiness is the last thing Claudius is concerned about. He's a conspicuously extravagant man trying to arouse good cheer in his new role as king and has just recently thrown both a lavish wedding and a gigantic funeral for the departed King Hamlet. By saying "thrift, thrift," Hamlet remarks upon his stepfather's extravagance and reminds Horatio that they're supposed to still be in mourning for the king.