In the Washington world, where handshakes shared with major power players often turn into photos on an office wall, Thomas Cubbage III of Covington & Burling shows off only one vintage side-by-side shot with a famous person: Alex Trebek.

Since that encounter in 1989, Trebek and Cubbage have met a handful of times on “Jeopardy”—most recently in December, when the lawyer played in the show’s 1980s “Battle of the Decades.” That episode airs tonight.