Two and a half times.
First from a Target distribution warehouse. Deserved it. I was young and just goofed off all day.
Second from a lumberyard. Deserved it. Another employee and I got into an argument, he threatened to shoot me, so I spit on him thinking it would provoke him to fight, but he just ran and told a manager that I spit on him.
The third half time I got hired to stock shelves at a Target. This was across the country from the warehouse job. Well, I got hired just fine, but HR kept asking if I ever worked for Target in Colorado, which I denied, but I knew it was only a matter of time before they pieced it together and fired me, so I just stopped going to work.