Mortimer Brewster has stopped by his aunts’ house before going on a
Mortimer: Aunt Abby!
Abby: Yes, dear?
Mortimer: You were going to make plans for Teddy to go to that … sanitarium--Happy Dale--
[... … …]
Abby: No, dear, because I remember when Mr. Hoskins first came in, it occurred to me that he would make just an even dozen.
Martha: Well, you really shouldn’t count the first one.
Abby: Oh, I was counting the first one. So that makes it twelve.
For the full extended scene, refer to Joseph Kesselring, Arsenic and Old Lace. Dramatists Play Service, 1969. pp. 21-25.
More about this monologue