“Go on — fight, fight. I don't care. Oh, don't do that. It never...” – Mortimer Brewster, Arsenic and Old Lace ... Movie Quotes Database

[watching the fighting, lighting up a cigarette]

Go on — fight, fight. I don't care. [watching the police trying to bring down Jonathan with a shoe] Oh, don't do that. It never works. [Jonathan collapses] What do you know? it worked!

More from Arsenic and Old Lace

Mortimer Brewster No, no. I'm not a Brewster. I'm the son of a sea-cook! Ha! Ha! Chaaaaarrrge! Elaine Harper We were married today. We were going over Niagara Falls in a barrel. Your brother tries to kill me. A taxi is waiting and now you want to sleep on a window seat. You can take the honeymoon, your wedding ring, your taxi, your window seat, and put 'em in a barrel and push 'em all over Niagara Falls! Jonathan Brewster We better not leave the car parked in the street; it might be against the law.