History Funny / ArsenicAndOldLace

* Mortimer's increasingly funny [[SanitySlippage Sanity Slippage]]. He goes from suave, assured on-top-of-the-world [[OnlySaneMan Only Sane Man]], then ''discovers'' he's the [[OnlySaneMan Only Sane Man]] (because for that to happen, there's the rather unpleasant discovery that everyone else is ''in''sane, including all of his family, and it may be hereditary), and the rest of the movie is basically him not dealing well with that information while managing about three or four plotlines at once. By the end, [[spoiler: he's been morphed into a high-strung, [[SeenItAll Seen It All]] man who's over the moon to find out he's not in hereditary danger of a mental disease, but may have been driven to one anyway]].

* Jonathan slowly coming to the realization that he and his kindly old aunts [[spoiler: have murdered the ''same number of people'']].

* When Mortimer calls Witherspoon to get Teddy committed, Witherspoon delicately notes that they already have ''several'' patients who think they're Teddy Roosevelt, and suggests that Mortimer try to convince him that he's Napoleon instead.

*** Einstein insists that Jonathan can't count the one in South Bend, since he died of pneumonia. ''"He wouldn't have died of pneumonia if I hadn't '''shot''' him!"''

** One of the cops even reads of a description of him from his wanted poster while he's ''standing right there'' without realizing it.

* Just after Mortimer has successfully committed Teddy and his aunts to the asylum without revealing they have murdered a dozen people, Elaine discovers the bodies and runs up screaming, nearly blowing the whole thing. Mortimer shuts her up kissing her repeatedly and carrying her out of the house.

--> '''Aunt Martha''': Spenalzo?

* Aunt Abby leads Aunt Martha out to see the "total stranger" that is in the window seat, prompting both Mortimer and Jonathan to rush to the window seat to prevent her from seeing the body of Mr. Spenalzo. The comical look of dawning comprehension on Mortimer's face as he realizes just who is responsible for the latest corpse must be seen to be believed.

* The cab driver who apparently spends the whole movie waiting outside (with the meter running) for Mortimer and Elaine so they can go on their honeymoon. By the end, they’ve apparently racked up enough to ''buy'' it.

** And of course, Joanthan's frustration that while he's been hunted like a dog for years due to his murders, his aunts have never been caught and are still living their happy lives.

* After being confronted by her nephew Mortimer about the twelve men she and her sister have murdered, Aunt Abby huffily informs Mortimer that she "would never stoop to telling a fib!"

** And of course, his frustration that while he's been hunted like a dog for years due to his murders, his aunts have never been caught and are still living their happy lives.

** Teddy's encounter with Jonathan:

** He even gives Jonathan some idiots

* Any time CaryGrant does a DoubleTake.

* After being confronted by her nephew Mortimer about the twelve men she and her sister have murdered, Aunt Abby huffily informs Mortimer that she "would never stoop so low as telling a fib!"