During 1988, when Grayson had just turned thirty and while working for the Fried, Frank, Harris, Shriver & Jacobson law firm, he spent four days in the Psychiatric Institute of Washington.
What the cause of this stay was is yet unclear, although testimony from co-workers suggests that Grayson was extremely combative with fellow employees, including slapping a female intern in the face.
Grayson was released after PIW doctors declared him “not to be a threat to the public.”
SOURCE http://www.sodahead.com/fun/congressman-grayson-briefly-spent-time-in-mental-hospital/blog-179793/