Mama Foley's baby boy has sustained countless concussions from any number of dangerous falls, slams on concrete, and shovel shots during the course of his career. The concussion that Mick is most known for, by far, was one he suffered at the Hell in the Cell match against Undertaker at King of the Ring '98. Although the entire match was dangerous the worst of it was when Undertaker chokeslammed Foley through the ceiling of the cage. Foley not only fell to the canvas like a sack of potatoes but a steel chair had also dropped and cracked Foley in the head as he landed. This was enough to send a glaze over Foley's eyes and knock him out for a time. https://www.youtube.com/watch?v=U09oXyiAkOc As most fans clearly know, Foley went on to not only finish the match but also get slammed into thousands of thumbtacks before losing to Undertaker. Yet, as he tells it, he had to ask Taker post match if they had used them, despite still having an armful of tacks. Although this match was equal parts scary and captivating it was also extremely dangerous. The brain injuries Foley sustained in this match, combined with all his others, were part of the reasons Foley decided to retire the first time, especially with fans expecting him to keep up the dangerous stunts.