Mr. Big happened! Flo is doing better than Mr. Big expected! In an attempt to sabotage her progress, Mr. Big is messin' with the power! When the lights flicker, the power is about to go out. 

Once the power goes out, all of the customers and tables will turn gray and color matches will become more difficult. Purchase Shine-O from the Restaurant Store to counteract the effects of Mr. Big's sabotage attempts! 
Shine-O at work: