Vengeance:

"No place indeed should murder sanctuarize; revenge should have no bounds." (Claudius)

"The play's the thing wherein I'll catch the conscience of the King." (Hamlet)

"That drop of blood that's calm proclaims me bastard, cries cuckold to my father, brands
the harlot even here between the chaste, unsmirched brow of my true mother." (Laertes)

"Adieu, adieu, adieu.  Remember me." (King Hamlet)