[If] a spark flies out from under a hammer and damages, he is liable. [If] a camel that is laden with flax stands in the public domain, and its flax protrudes into a shop, catches fire from the shopkeeper's lamp and ignites a large tower, the owner of the camel is liable. [If] the shopkeeper leaves his lamp outside, the shopkeeper is liable. R' Yehudah says: In [the case of] a Chanukah light, he is exempt.