Ever been to a Nevada sports book and just stared at the odds board? Of course not — you have better things to do, such as attend pool parties.

Well, should you pay attention to that brightly colored board, you may see the odds move on a game or two, maybe a line or a total changing by a half-point or so.

So what causes odds to change? Well, any number of things. Sometimes, though, it’s the simplest answer — a big bet.

This brings us to the case of the Cleveland Browns’ Super Bowl odds at the MGM Resorts International sports books in Nevada. Cleveland, once 200-to-1 to win the title, is now 30-to-1 at the MGM books, according to David Purdum of BettingTalk.com.

MGM oddsmaker Jay Rood told Betting Talk that a “four figure” wager on the Browns last week caused MGM to slash its odds from 100-to-1 all way down to 30-to-1.