Donald Trump had a successful Super Tuesday, winning seven Republican primaries. But it was one of his high-profile surrogates -- New Jersey Gov. Chris Christie -- who dominated social media.

Christie introduced the real estate mogul before his Super Tuesday speech. And as Christie remained on stage, it was his expression, not Trump's words, that everyone paid attention to. While the governor is known for appearing dour behind the podium, many thought Christie looked as if he had been taken hostage or was seriously regretting endorsing Trump. Even into Wednesday morning, Chris Christie was still a trending topic on Twitter, with a #FreeChrisChristie hashtag still surfacing.

Here are some of our favorite tweets about the governor's expression: