He absolutely has the strangely flushed face of what the French call "un forcene"

adjectif
vieux Qui perd la raison.
Qui dépasse toute mesure. Une envie forcenée.
Animé d'une rage folle. furieux.
Emporté par une folle ardeur. acharné. Un travailleur forcené.
nom Personne en proie à une crise furieuse.

For some reason it seems funnier in French.

Etymology
From French forcené (“rabid”), past participle of forcener (“to go mad, become enraged”), from Middle French, from Old French forsener (“to be mad with rage”) (compare Old French forsenede (“one who has lost his mind”)), from for- + sen (“sense, reason, mind”), from Frankish *sinn (“sense, mind, judgement”).