He was so heavy.
3 seconds sound clip from the The Silence of the Lambs movie soundboard.
You can hear this line at 01:11:58 in the Blu-ray version of the movie.
Quote context
[...]
- Yes. (4)
- I took one lamb and I ran away as fast as I could.
- Where were you going, Clarice?
- I don't know. I didn't have any food, any water, and it was very cold. It was very cold.
- I thought... I thought if I could save just one, but... he was so heavy.
- I didn't get more than a few miles when the sheriff's car picked me up.
- Rancher was so angry, he sent me to live at the Lutheran orphanage in Bozeman.
- I never saw the ranch again.
- What became of your lamb, Clarice?
[...]