We've all been there before. You order a Grande Latte and when your order comes you notice it's only 3/4 full so you add some milk and sugar to make up for the emptiness.

Honestly, it annoys us all from time to time, but two Starbucks regulars in California have decided to sue the company for ripping them (and everyone) off.

Siera Strumlauf and Benjamin Robles are suing the coffee company for purposefully underfilling their cups.

In a class action suit filed this week, the two claim that Starbucks is leaving customers short by 25 percent, which they say is an act of fraud in order to cut company costs.

In the lawsuit, they claim that employees have a secret line inside the cup so they know when to stop pouring. And that is all the evidence they need to sue the caffeine chain.

Starbucks "has saved countless millions of dollars in the cost of goods sold and was unjustly enriched by taking payment for more product than it delivers," it claims.

However, Starbucks say that the whole thing is nonsense and each beverage is individually poured, making every cup different.