Charles Grodin, the comic relief to De Niro in Midnight Run, but who truly excels as the scheming Tony Abbot in one of my childhood VHS favourites Heaven Can Wait.
Also, anyone who appeared in This Is Spinal Tap or Trading Places, even in the most insignificant of cameos.
From Bo Diddley, who's in both, to the Hermitage Club's 'five dollars, maybe I'll go to the movies...by myself' footman, everyone is superb.
All of this. I love Midnight Run and Trading Places, two of the very best.