On the final play of Monday night's NFL game, a controversial touchdown call changed the game's outcome.
It also reversed the Las Vegas outcome. Instead of the Packers covering the 3.5 point spread, they did not cover.
Sounds like a nuance, but in seconds, most bettors went from winners to losers and losers to winners — with some major money involved.
Some sources say it was a $150-300 million dollar swing. Various Las Vegas sources told CNBC, it was much more than that.
"Everyone says you should multiply Vegas betting by ten to get the overall number," said John Netto, President of Vegas-based Quantitative Sports Strategies. "But it's more like 100 times.