When startled, the Thunderdrum produces a concussive sound that can kill a man at close range.
7 seconds sound clip from the How to Train Your Dragon movie soundboard.
You can hear this line at 00:23:25 in the Blu-ray version of the movie.
Quote context
[...]
- You guys read. I'll go kill stuff.
- Read it.
- So, OK, I'll see you... tomorrow.
- Dragon classifications. Strike class. Fear class. Mystery class.
- Thunderdrum. This reclusive dragon inhabits sea caves and dark tide pools.
- When startled, the Thunderdrum produces a concussive sound that can kill a man at close range.
- Extremely dangerous. Kill on sight.
- Timberjack. This gigantic creature has razor-sharp wings that can slice through full-grown trees.
- Extremely dangerous. Kill on sight. (2)
- Scauldron. Sprays scalding water at its victim.
[...]