This story teaches you at least two valuable life lessons. Never take a bet you might later regret. And never underestimate the power of social media.

Kelsey Hall, a 20-year-old student from the University of Alabama, posted on Twitter a pic of herself while wearing a Christmas tree costume and challenged Twitter to give her 1,000 retweets and she'd wear it for the rest of the semester:

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But as the retweets trickled in, she soon regretted it:

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People got back on Twitter just to retweet her:

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Calls to retweet her multiplied over the hours and Kelsey started to get nervous:

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Even Twitter official account weighed in:

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Kelsey was now resigned to taking up the challenge:

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The tweet got more than 15,000 retweets, and she had to follow through:

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I mean, seriously, look at her face:

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Closer...

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This is the face of regret. Lesson learned.