Or we could sit on them one by one and squash them into jelly!
Balin, a dwarf
Gandalf To The Rescue!
You´re a liar.
No good roasting ´em now, it´d take all night.
Don´t start the argument all over again, Bill, or it will take all night.
After the trolls catch Bilbo trying to steal from them, they start fighting about when they should eat him. The dwarves, who were hiding in the distance, heard the fighting and rushed over. They are captured after a fight and are tied up.
This is when Gandalf decides to head back after exploring the road ahead. He finds Bilbo and the dwarves all tied up. He hides, and imitates the troll´s voices, making it sound like they are arguing. This makes them argue until the sun rises, and they become stone. Gandalf releases the dwarves and Biblp from the ropes, and then they travel to the troll´s cave to look for supplies.