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Crazy Burger is a new restaurant Brianna and Nikki went to in Dork Diaries: Tales From A Not-So-Smart Miss Know-It-All. Most of their items are priced $7.99. Nikki states that the food in Crazy Burger is unhealthy because when she asks the man what is the difference between two burgers, he says "One causes strokes, the other heart attacks". However, she enjoys them.
At the very end of book 5, this is the place that Brandon asks Nikki to go out to. It's their first date. Then after being held off for quite a while, they have a date at Crazy Burger. They have an awkward "conversation" until their food arrives. After they eat, this is where she asks him to the Sweetheart Dance.