Someone who was in the middle of tovelling a number of kelim was asked by a katan that came just then in the middle that he should tovel his (the katans kelim) as well. Should a new bracha be made? What about if the katan came when the person had already finished tovelling his own kelim?
Yes, a new berachah should be made, because there was obviously no intention with the initial berachah to include the keilim that were brought in the middle.
This can be paralleled to the case of somebody eating a fruit, when somebody else brought him a different fruit, on which a new berachah is required.