"Mornin’!" Hagrid said, grinning at Harry, Ron, and Hermione. "Be’er wait fer the Slytherins, they won’ want ter miss this — Blast-Ended Skrewts!" [...]
"Ouch!" yelled Dean Thomas after about ten minutes. "It got me!"
Hagrid hurried over to him, looking anxious.
"Its end exploded!" said Dean angrily, showing Hagrid a burn on his hand.
"Ah, yeah, that can happen when they blast off," said Hagrid, nodding.

Harry Potter and the Goblet of Fire