Most serial killers keep some sort of trophies from their victims.

5 seconds sound clip from the The Silence of the Lambs movie soundboard.

You can hear this line at 00:16:18 in the Blu-ray version of the movie.

Quote context

[...]

- Well, it started as a bad joke in Kansas City Homicide.

- They said, This one likes to skin his humps.

- Why do you think he removes their skins, Agent Starling?

- Thrill me with your acumen.

- It excites him.

- Most serial killers keep some sort of trophies from their victims.

- I didn't.

- No. No, you ate yours.

- You send that through now.

- [tray slides open, closes]

[...]