He Bounces Back

 And Joker walks away-- heads for the sliding glass doors. Only the motion detector doesn't engage--

 AND HE SLAMS RIGHT INTO THE GLASS DOOR.

 HARD.

 He bounces back.

61 EXT. CITY HOSPITAL, ER - NIGHT 61

 Joker sits on a bench outside the bustling emergency room. He's getting some fresh air, but he picked a weird spot to do it.

 He watches the sick and dying being rushed through the glass doors. Opening and closing. This happens in the background throughout the scene. 62. 

The two detectives walk up to Joker, interrupting him watching the doors. Gotham police detectives, GARRITY (50's), grey hair, and BURKE (30's), his partner.

 DET. GARRITY

Mr. Fleck, sorry to bother you, I'm Detective Garrity, this is my partner Detective Burke.

Joker looks up at them. Doesn't say anything.

DET. GARRITY

We had a few questions for you, but you weren't home. 

So we spoke to your mother.

JOKER

You did this to her?

DET. GARRITY

What? No. 

We just asked her some questions and she started getting hysterical-- 

hyperventilating, trouble speaking-- then she collapsed. 

Hit her head pretty hard.

 JOKER 

They told me she had a stroke.

Beat.

 DET. GARRITY 

Sorry to hear that.

AND JOKER BURSTS OUT LAUGHING, he can't stop it.

The detectives are taken aback. 

They don't know what to make of him laughing.

They share a look.

 DET. BURKE 

(confused) 

I'm lost. Is something funny?

JOKER 

(laughter choking up in his throat) 

No I,-- I have a, a--

Tears rolling down his face, he takes out one of his cards and hands it to Det. Burke. Burke glances over the card, a skeptical look on his face. 

 DET. BURKE 

Okay. But we have some questions for you.

 DET. GARRITY 

About those subway killings from a few weeks ago.

Joker pauses for a moment, his laughter subsiding. He holds his breath.

 JOKER 

I don't know anything about that.

 DET. GARRITY 

We have an eyewitness who described a white male, about 6 feet tall, in clown make up. Or a clown mask. 

Spoke to your boss at Ha-Ha's, Mr. Vaughn, and he said you were on a job the day of the shooting.

Joker's still holding his breath, he nods yes.

 DET. GARRITY (just continues) 

He also said you got fired that day,-- 

For bringing a gun into the children's hospital.

And Joker cracks up again, his laughter coming back harder-- He covers his mouth with his hand, shaking his head no, his face now turning red.

 DET. GARRITY 

You weren't fired?

Joker catches his breath as the intensity of his laughter starts to wane, petering out.

JOKER 

Not for having a gun. That was prop gun. Part of my act.

Joker's laughter finally stops for good.

 DET. BURKE 

So why were you fired?

 JOKER 

They said I wasn't funny.

The detectives share another look.

 Joker stands up.

 JOKER 

Now, if you don't mind, I have to go back and look after my mother.

 Detective Burke steps close to him, holds up the card that Joker handed him--

DET. BURKE

Hey lemme ask you a question? This condition of yours,-- 

Is This Real or is this like some sorta Clown Thing?

 JOKER 

"Clown thing?"

DET. BURKE 

I mean, is it part of your act?

JOKER 

What do you think?

 And Joker walks away-- heads for the sliding glass doors. Only the motion detector doesn't engage--

 AND HE SLAMS RIGHT INTO THE GLASS DOOR.

 HARD.

 He bounces back.