[Xist]

From the article that I shared in the first post:

In January, Toledo, Ohio, resident Melodi Dushane punched out a McDonald's drive-through window when she was told they didn't sell Chicken McNuggets in the morning. [...] A Wendy's customer reportedly assaulted a female clerk at a drive-through window in 2007 after she didn't tell him to "have a nice day." The list goes on.

This article only covers violence to customers in drive-throughs: Drive-Through Danger : Crime: Robberies and attacks increase on customers using drive-up windows at fast-food restaurants. Some chains increase security. - latimes