Presidential candidate Andrew Yang promised he will do something "big" and "unprecedented" while on the debate stage Thursday.

A senior campaign official told NBC News that the Democratic presidential candidate has a surprise planned for the debate but would not reveal what it was.

Yang will take the stage along with nine other candidates, including former Vice President Joe Biden, Sen. Bernie Sanders (I-Vt.) and Sen. Elizabeth Warren (D-Mass.) who have been leading the polls.

The businessman has been joining the fun on Twitter as people speculate what the candidate is up to, hinting about wearing crowdsurfing sandals and tweeting that "ninja-style headwear makes everything cooler."

He also replied on Twitter to a statement from Trevor Noah in a "The Daily Show" video, where the comedian said Yang will "have to keep escalating your stunts."

Yang responded, "Don't worry @Trevornoah, we've got something big in store! @TheDailyShow #StayTuned #DemDebate."

The promise has sparked a wide variety of theories on what the surprise could be.

A spokesman from the Yang campaign confirmed the announcement will be in the opener.

Yang has been receiving increased attention and higher polling numbers in the past week. He also said earlier this week that he would "school" President Trump in a one-on-one basketball game.