Shares of restaurant Red Robin Gourmet Burgers (NASDAQ: RRGB) were hit hard on Wednesday after the company reported its fiscal first-quarter results. Shares fell as much as 20.5%, but are down about 19% at 11:24 a.m. EDT.Bearishness toward the stock on Wednesday is likely because the company's revenue and adjusted earnings per share for the quarter were below the consensus analyst estimates for the two key metrics.