Presidential candidate Andrew YangAndrew YangGeorge Floyd protests show corporations must support racial and economic equality Andrew Yang discusses his universal basic income pilot program Andrew Yang on the George Floyd protests in Minneapolis MORE 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 BidenJoe BidenHillicon Valley: Biden calls on Facebook to change political speech rules | Dems demand hearings after Georgia election chaos | Microsoft stops selling facial recognition tech to police Trump finalizing executive order calling on police to use ‘force with compassion’ The Hill’s Campaign Report: Biden campaign goes on offensive against Facebook MORE, Sen. Bernie SandersBernie SandersThe Hill’s 12:30 Report: Milley apologizes for church photo-op Harris grapples with defund the police movement amid veep talk Biden courts younger voters — who have been a weakness MORE (I-Vt.) and Sen. Elizabeth WarrenElizabeth WarrenWarren, Democrats urge Trump to back down from veto threat over changing Confederate-named bases OVERNIGHT DEFENSE: Joint Chiefs chairman says he regrets participating in Trump photo-op | GOP senators back Joint Chiefs chairman who voiced regret over Trump photo-op | Senate panel approves 0B defense policy bill Trump on collision course with Congress over bases with Confederate names MORE (D-Mass.) who have been leading the polls.

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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.”

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He also replied on Twitter to a statement from Trevor NoahTrevor NoahWhite House accuses Biden of pushing ‘conspiracy theories’ with Trump election claim Biden says military will escort Trump from White House if he loses and refuses to leave Host Trevor Noah to pay salaries of furloughed ‘Daily Show’ crew MORE 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 TrumpDonald John TrumpSenate advances public lands bill in late-night vote Warren, Democrats urge Trump to back down from veto threat over changing Confederate-named bases Esper orders ‘After Action Review’ of National Guard’s role in protests MORE in a one-on-one basketball game.