Two great moments in Robert Altman films: Gibson as the sinister Dr. Verringer confronting and slapping the much bigger Roger Wade in The Long Goodbye ; Gibson as the vain and ridiculous country music ringmaster Haven Hamilton rising to the occasion and trying to reign in the chaos at the conclusion of Nashville
And a magnificent cameo as Thurston Howell in P.T. Anderson’s Magnolia.
Can’t beat the above, but he got to strut magnificently as the head Illinois Nazi in The Blues Brothers, and Joe Dante frequently threw Gibson into his mix of recurrent character actors…. particularly wonderful in the alas-not-all-that-wonderful The ‘Burbs.