Because she sent me over.
3 seconds sound clip from the Taxi Driver (1976) movie soundboard.
You can hear this line at 01:16:03 in the Blu-ray version of the movie.
Quote context
[...]
- I'll be over there waiting for you.
- Okay.
- Your name Matthew? I want some action.
- Officer. I swear I'm clean. I'm just waiting here for a friend. You gonna bust me for nothing, man?
- Then why are you asking me for action?
- I suppose that ain't a .38 you've got in your sock.
- A .38?
- Shit, you're a real cowboy? That's nice, man. All right. That's all right.
- Fifteen dollars, 15 minutes. Twenty-five dollars, half an hour.
[...]