The context of the following conversation is Someone has been stealing money from Riley. Riley leaves some money on the counter in the kitchen and watches Jesse closely.:
Riley says Well, I finally know who has been taking my money?.
The friend responds Really?  Who was it?.
Riley responds It was Jesse!.
The friend responds Are you sure?  How did you catch him?.
Riley responds I left the money out on the counter and watched him..
The friend responds I can't believe he took your money..