The central theme of Arsenic and Old Lace revolves around the contrast between the facade of the ordinary and the underlying chaos of human behavior. The play cleverly juxtaposes the seemingly serene lives of the elderly Brewster sisters with the dark comedic undertones of their actions, illustrating how appearances can be deceiving.
Another significant theme is the notion of family and the complexities that come with it. The play showcases the bonds between the characters, highlighting both the love and the dysfunction that often accompanies familial relationships. This sets the stage for comedic situations and darker revelations about their family history.
Moreover, the theme of mental illness is also prevalent, as characters grapple with their own sanity and the consequences of their actions. The blend of humor and horror in this play ultimately offers a reflection on human nature, the morality of right and wrong, and the lengths one might go to for family.