Could someone explain this joke to me? About a Moroccan guy?

I’m watching The Sopranos, and this dialog just happened:

Tony: “I knew a Moroccan guy once. He hit and ran me. I tracked him down. I never forget a face!”

Gloria: “Jesus Christ, that’s the oldest joke in the book.”

What?

What’s the joke? I don’t get it? Am I really, really stupid and missing something here?

“I never forget a fez”?

Probably. Thanks.