CaptainSparklez is known to show the same reaction to a Reddit post he's seen before and recorded. Usually, he doesn't remember reacting to a post that he's already reacted to in a previous video. The reactions between the two (or more) posts are almost the same.

People often overlap the two (or more) soundclips and post them on the CaptainSparklez subreddit.

CaptainSparklez: I swear it's not on purpose. ... I'm just really consistant. Nothing changes enough in my life to merit a different response to anything. I don't have enough new life experiences that change my perspective, my outlook, it's always the same.