What do you always do to get going when you feel like you are spacing out?

I don't know if this was the right way to phrase my question.

I have this problem where I space out every now and then, I just can't shake it off and start doing the things I should be doing.

For example - If I'm in a room with a bunch of people who I should be talking to, I will most likely speak a few times and then I'd space out and look like Kanye's Blank Stare meme.