He made a cameo appearance as a man carrying a violin in his own film "Spellbound"
[DOC] [TLE] Hitchcock's Hidden Pictures: Critical Inquiry: Vol 37, No 1 [PAR] Indeed, as he waves his valise in the air to avoid grazing the fat man's fat 
instrument, his ... gloating is as definitive of the cameo as is Hitchcock's own flesh 
and blood.