We all know the feeling of overpaying for a beer at a sports event.

Every stadium, arena, and venue in the world adds on a little extra for the privilege.

But eagle-eyed fans at the CenturyLink Arena in Bosie, Idaho have made a discovery that has taken it too far...

Earlier this week, while watching a game at the Arena, fans noticed that both the $4 'regular' beer, and the $7 'large' beer actually contained exactly the same amount of the tasty beverage.

Their extensive research even included a YouTube video to substantiate their claim.

After voicing their anger at the venue the Arena accepted their mistake and vowed to increase the ''large' beer cups by a whole 4 ounces while reducing the price to $6.

But the fans are clearly not happy with the outcome.

As reported by kboi.com, four supporters filed a lawsuit against the arena on the grounds that the people in charge had committed fraud by selling the supposedly larger beers at a higher price.

Brady Peck, Michele Bonds and William and Brittany Graham are seeking $10,000 in damages after claiming to have bought large beers at numerous events dating back five years.

The CenturyLink Arena plays host to ECHL team Idaho Steelheads and NBA D-league outfit the Idaho Stampede.

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