Arsenic and Old Lace (1944)
Grant Mitchell: Reverend Harper
Reverend Harper : Have you ever tried to persuade him that he wasn't Teddy Roosevelt?
Abby Brewster : Oh, no.
Martha Brewster : Oh, he's so happy being Teddy Roosevelt.
Abby Brewster : Oh... Do you remember, Martha, once, a long time ago, we thought if he'd be George Washington, it might be a change for him, and we suggested it.
Martha Brewster : And do you know what happened? He just stayed under his bed for days and wouldn't be anybody.
Police Sgt. Brophy : Look, Sergeant, I promised ya I wouldn't swear but what the he -
[stops, noticing the Reverend]
Police Sgt. Brophy : What's goin' on here anyway?
Reverend Harper : Oh, he's quite harmless.
Police Sgt. Brophy : Thinks he's Teddy Roosevelt. So what? There's a lot of worse guys he could think he was.