[logari]

There are two types of interruptors: the intelligent and the stupid.

The intelligent ones have a lot to say, and worry they forget, so they want to edge in a few of that "block" chain before it's lost.

The stupid ones are simply rude and don't care about your feelings.

Step1: identify from other clues, what type you are dealing with.

Step2: if intelligent, let them finish their speech. Then ask: "are you finished?" Then ask for uninterrupted talk time. You can be humorous about it. For instance: "if the urge to cut me off hits you, take notes while I am speaking." If they took notes, ask them to rephrase what you just told them.

If the stupid type, you can cut them off, too. It is okay to be fair.