Hitchcock always made one of these in his films

noun

1. A gem carved in relief see relief
2. A small medallion see medallion with a profiled head in relief
3. A carving or sculpture made in the manner of a cameo
4. A usually brief literary or filmic piece that brings into delicate or sharp relief the character of a person, place, or event

   "his cameos and short commentaries on men and manners"

5. A small theatrical role usually performed by a well-known actor and often limited to a single scene

   "A major star appears in a cameo in the movie."